| secondhand | (adjective) previously used or owned by another | Synonyms: used |
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| (adjective) derived from what is primary or original; not firsthand | - |
| (adverb) by indirect means | - |
| secondly | (adverb) in the second place | Synonyms: second |
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| secondment | (noun) the detachment of a person from their regular organization for temporary assignment elsewhere | - |
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| (noun) a speech seconding a motion | Synonyms: endorsement, indorsement, second |
| secondo | (noun) the second or lower part of a duet (especially a piano duet) | - |
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| secpar | (noun) a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years | Synonyms: parsec |
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| secrecy | (noun) the trait of keeping things secret | Synonyms: secretiveness, silence |
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| (noun) the condition of being concealed or hidden | Synonyms: concealment, privacy, privateness |
| secret | (adjective) the next to highest level of official classification for documents | - |
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| (adjective) not open or public; kept private or not revealed | - |
| (adjective) having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding | Synonyms: mysterious, mystic, mystical, occult, orphic |
| (adjective) not expressed | Synonyms: private |
| (adjective) (of information) given in confidence or in secret | Synonyms: confidential |
| (adjective) not openly made known | Synonyms: unavowed |
| (adjective) conducted with or marked by hidden aims or methods | Synonyms: clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, surreptitious, undercover, underground |
| (adjective) designed to elude detection | Synonyms: hidden |
| (adjective) indulging only covertly | - |
| (adjective) hidden from general view or use | Synonyms: privy, secluded |
| (adjective) communicated covertly | - |
| (noun) something that baffles understanding and cannot be explained | Synonyms: closed book, enigma, mystery |
| (noun) something that should remain hidden from others (especially information that is not to be passed on) | - |
| (noun) information known only to a special group | Synonyms: arcanum |
| secretaire | (noun) a desk used for writing | Synonyms: escritoire, secretary, writing table |
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| secretarial | (adjective) of or relating to a secretary or to a secretary's work | - |
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| secretariat | (noun) an administrative unit responsible for maintaining records and other secretarial duties; especially for international organizations | Synonyms: secretariate |
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| secretariate | (noun) an administrative unit responsible for maintaining records and other secretarial duties; especially for international organizations | Synonyms: secretariat |
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| secretary | (noun) a desk used for writing | Synonyms: escritoire, secretaire, writing table |
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| (noun) an assistant who handles correspondence and clerical work for a boss or an organization | Synonyms: secretarial assistant |
| (noun) a person who is head of an administrative department of government | - |
| (noun) a person to whom a secret is entrusted | Synonyms: repository |
| secretaryship | (noun) the position of secretary | - |
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| secretase | (noun) a set of enzymes believed to snip pieces off a longer protein producing fragments of amyloid protein that bunch up and create amyloid protein plaques in brain tissue (the pathological hallmark of Alzheimer's) | - |
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| secrete | (verb) generate and separate from cells or bodily fluids | Synonyms: release |
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| (verb) place out of sight; keep secret | - |
| secreter | (noun) any of various organs that synthesize substances needed by the body and release it through ducts or directly into the bloodstream | Synonyms: gland, secretor, secretory organ |
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| secretin | (noun) a gastrointestinal hormone that stimulates the secretion of water and bicarbonate from the pancreas and bile ducts whenever the stomach empties too much acid into the small intestine | - |
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| secretion | (noun) a functionally specialized substance (especially one that is not a waste) released from a gland or cell | - |
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| (noun) the organic process of synthesizing and releasing some substance | Synonyms: secernment |
| secretive | (adjective) inclined to secrecy or reticence about divulging information | Synonyms: close, closelipped, closemouthed, tightlipped |
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| secretively | (adverb) in a secretive manner; with a preference for secrecy | - |
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| secretiveness | (noun) characterized by a lack of openness (especially about one's actions or purposes) | Synonyms: closeness |
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| (noun) the trait of keeping things secret | Synonyms: secrecy, silence |
| secretly | (adverb) in secrecy; not openly | Synonyms: in secret, on the Q.T., on the QT |
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| (adverb) not openly; inwardly | - |
| secretor | (noun) any of various organs that synthesize substances needed by the body and release it through ducts or directly into the bloodstream | Synonyms: gland, secreter, secretory organ |
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| secretory | (adjective) of or relating to or producing a secretion | - |
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| sect | (noun) a dissenting clique | Synonyms: faction |
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| (noun) a subdivision of a larger religious group | Synonyms: religious order, religious sect |
| sectarian | (adjective) of or relating to or characteristic of a sect or sects | - |
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| (noun) a member of a sect | Synonyms: sectarist, sectary |
| sectarianism | (noun) a narrow-minded adherence to a particular sect or party or denomination | Synonyms: denominationalism |
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| sectarist | (noun) a member of a sect | Synonyms: sectarian, sectary |
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| sectary | (noun) a member of a sect | Synonyms: sectarian, sectarist |
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| section | (noun) the cutting of or into body tissues or organs (especially by a surgeon as part of an operation) | Synonyms: incision, surgical incision |
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| (noun) one of several parts or pieces that fit with others to constitute a whole object | Synonyms: segment |
| (noun) one of the portions into which something is regarded as divided and which together constitute a whole | Synonyms: division, part |
| (noun) a self-contained part of a larger composition (written or musical) | Synonyms: subdivision |
| (noun) a segment of a citrus fruit | - |
| (noun) a small army unit usually having a special function | - |
| (noun) a division of an orchestra containing all instruments of the same class | - |
| (noun) a small team of policemen working as part of a police platoon | - |
| (noun) a specialized division of a large organization | Synonyms: department |
| (noun) a small class of students who are part of a larger course but are taught separately | Synonyms: discussion section |
| (noun) (geometry) the area created by a plane cutting through a solid | Synonyms: plane section |
| (noun) a distinct region or subdivision of a territorial or political area or community or group of people | - |
| (noun) a very thin slice (of tissue or mineral or other substance) for examination under a microscope | - |
| (noun) a land unit equal to 1 square mile | - |
| (verb) divide into segments | Synonyms: segment |
| sectional | (adjective) relating to or based upon a section (i.e. as if cut through by an intersecting plane) | - |
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| (adjective) consisting of or divided into sections | Synonyms: sectioned |
| (adjective) related or limited to a distinct region or subdivision of a territory or community or group of people | - |
| (noun) a piece of furniture made up of sections that can be arranged individually or together | - |
| sectionalisation | (noun) the act of dividing or partitioning; separation by the creation of a boundary that divides or keeps apart | Synonyms: division, partition, partitioning, sectionalization, segmentation |
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| sectionalise | (verb) divide into sections, especially into geographic sections | Synonyms: sectionalize |
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| sectionalism | (noun) a partiality for some particular place | Synonyms: localism, provincialism |
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| sectionalization | (noun) the act of dividing or partitioning; separation by the creation of a boundary that divides or keeps apart | Synonyms: division, partition, partitioning, sectionalisation, segmentation |
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| sectionalize | (verb) divide into sections, especially into geographic sections | Synonyms: sectionalise |
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| sectioned | (adjective) consisting of or divided into sections | Synonyms: sectional |
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| sector | (noun) measuring instrument consisting of two graduated arms hinged at one end | - |
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| (noun) a particular aspect of life or activity | Synonyms: sphere |
| (noun) a social group that forms part of the society or the economy | - |
| (noun) a portion of a military position | - |
| (noun) the minimum track length that can be assigned to store information; unless otherwise specified a sector of data consists of 512 bytes | - |
| (noun) a plane figure bounded by two radii and the included arc of a circle | - |
| sectorial | (adjective) relating to or resembling a sector | - |
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| secular | (adjective) of or relating to clergy not bound by monastic vows | - |
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| (adjective) not concerned with or devoted to religion | Synonyms: profane |
| (adjective) characteristic of or devoted to the temporal world as opposed to the spiritual world | Synonyms: temporal, worldly |
| (adjective) of or relating to the doctrine that rejects religion and religious considerations | - |
| (adjective) characteristic of those who are not members of the clergy | Synonyms: laic, lay |
| (noun) someone who is not a clergyman or a professional person | Synonyms: layman, layperson |
| secularisation | (noun) transfer of property from ecclesiastical to civil possession | Synonyms: secularization |
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| (noun) the activity of changing something (art or education or society or morality etc.) so it is no longer under the control or influence of religion | Synonyms: secularization |
| secularise | (verb) make secular and draw away from a religious orientation | Synonyms: secularize |
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| secularism | (noun) a doctrine that rejects religion and religious considerations | - |
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| secularist | (noun) an advocate of secularism; someone who believes that religion should be excluded from government and education | - |
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| secularization | (noun) transfer of property from ecclesiastical to civil possession | Synonyms: secularisation |
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| (noun) the activity of changing something (art or education or society or morality etc.) so it is no longer under the control or influence of religion | Synonyms: secularisation |
| secularize | (verb) make secular and draw away from a religious orientation | Synonyms: secularise |
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| (verb) transfer from ecclesiastical to civil possession, use, or control | Synonyms: desacralize |
| secundigravida | (noun) a woman who is pregnant for the second time | Synonyms: gravida II |
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| secure | (adjective) free from fear or doubt; easy in mind | Synonyms: unafraid, untroubled |
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| (adjective) free from danger or risk | - |
| (adjective) not likely to fail or give way | - |
| (adjective) immune to attack; incapable of being tampered with | Synonyms: impregnable, inviolable, strong, unassailable, unattackable |
| (adjective) financially safe | Synonyms: dependable, good, safe |
| (verb) make certain of | Synonyms: assure, ensure, guarantee, insure |
| (verb) cause to be firmly attached | Synonyms: fasten, fix |
| (verb) fill or close tightly with or as if with a plug | Synonyms: plug, stop up |
| (verb) furnish with battens | Synonyms: batten, batten down |
| (verb) get by special effort | Synonyms: procure |
| (verb) assure payment of | - |
| securely | (adverb) in a secure manner; in a manner free from danger | Synonyms: firmly |
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| (adverb) in an invulnerable manner | - |
| (adverb) in a manner free from fear or risk | - |
| (adverb) in a confident and unselfconscious manner | - |
| secureness | (noun) the quality of being fixed in place as by some firm attachment | Synonyms: fastness, fixedness, fixity, fixture |
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| (noun) the state of freedom from fear or danger | - |
| securer | (noun) someone who obtains or acquires | Synonyms: procurer |
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| security | (noun) measures taken as a precaution against theft or espionage or sabotage etc. | Synonyms: security measures |
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| (noun) an electrical device that sets off an alarm when someone tries to break in | Synonyms: security measure, security system |
| (noun) a guarantee that an obligation will be met | Synonyms: surety |
| (noun) freedom from anxiety or fear | - |
| (noun) a department responsible for the security of the institution's property and workers | Synonyms: security department |
| (noun) property that your creditor can claim in case you default on your obligation | Synonyms: surety |
| (noun) defense against financial failure; financial independence | Synonyms: protection |
| (noun) a formal declaration that documents a fact of relevance to finance and investment; the holder has a right to receive interest or dividends | Synonyms: certificate |
| (noun) the state of being free from danger or injury | - |
| sedan | (noun) a car that is closed and that has front and rear seats and two or four doors | Synonyms: saloon |
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| (noun) a closed litter for one passenger | Synonyms: sedan chair |
| sedate | (adjective) characterized by dignity and propriety | Synonyms: staid |
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| (adjective) dignified and somber in manner or character and committed to keeping promises | Synonyms: grave, sober, solemn |
| (verb) cause to be calm or quiet as by administering a sedative to | Synonyms: calm, tranquilize, tranquillise, tranquillize |
| sedately | (adverb) in a sedate manner | Synonyms: calmly |
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| sedateness | (noun) a trait of dignified seriousness | Synonyms: solemness, solemnity, staidness |
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| sedation | (noun) the administration of a sedative agent or drug | Synonyms: drugging |
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| (noun) a state of reduced excitement or anxiety that is induced by the administrative of a sedative agent | - |
| sedative | (adjective) tending to soothe or tranquilize | Synonyms: ataractic, ataraxic, tranquilising, tranquilizing, tranquillising, tranquillizing |
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| (noun) a drug that reduces excitability and calms a person | Synonyms: depressant, downer, sedative drug |
| sedentary | (adjective) requiring sitting or little activity | - |
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| sedge | (noun) grasslike or rushlike plant growing in wet places having solid stems, narrow grasslike leaves and spikelets of inconspicuous flowers | - |
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| sedgelike | (adjective) resembling rush or sedge | Synonyms: rushlike |
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| sedgy | (adjective) covered with sedges (grasslike marsh plants) | - |
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| sediment | (noun) matter that has been deposited by some natural process | Synonyms: deposit |
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| (verb) settle as sediment | - |
| (verb) deposit as a sediment | - |
| sedimentary | (adjective) produced by the action of water | Synonyms: aqueous |
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| (adjective) resembling or containing or formed by the accumulation of sediment | - |
| sedimentation | (noun) the phenomenon of sediment or gravel accumulating | Synonyms: alluviation, deposit |
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| sedition | (noun) an illegal action inciting resistance to lawful authority and tending to cause the disruption or overthrow of the government | - |
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| seditious | (adjective) in opposition to a civil authority or government | Synonyms: insurgent, subversive |
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| (adjective) arousing to action or rebellion | Synonyms: incendiary, incitive, inflammatory, instigative, rabble-rousing |
| seduce | (verb) lure or entice away from duty, principles, or proper conduct | - |
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| (verb) induce to have sex | Synonyms: make, score |
| seducer | (noun) a man who takes advantage of women | Synonyms: ladies' man, lady killer |
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| (noun) a bad person who entices others into error or wrongdoing | - |
| seduction | (noun) enticing someone astray from right behavior | - |
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| (noun) an act of winning the love or sexual favor of someone | Synonyms: conquest |
| seductive | (adjective) tending to entice into a desired action or state | - |
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| seductively | (adverb) in a tempting seductive manner | Synonyms: temptingly |
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| seductress | (noun) a woman who seduces | - |
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| sedulity | (noun) the quality of being constantly diligent and attentive | Synonyms: sedulousness |
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| sedulous | (adjective) marked by care and persistent effort | Synonyms: assiduous |
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| sedulously | (adverb) in a sedulous manner | - |
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| sedulousness | (noun) the quality of being constantly diligent and attentive | Synonyms: sedulity |
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| sedum | (noun) any of various plants of the genus Sedum | - |
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| see | (noun) the seat within a bishop's diocese where his cathedral is located | - |
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| (verb) deem to be | Synonyms: consider, reckon, regard, view |
| (verb) perceive (an idea or situation) mentally | Synonyms: realise, realize, understand |
| (verb) get to know or become aware of, usually accidentally | Synonyms: discover, find out, get a line, get wind, get word, hear, learn, pick up |
| (verb) be careful or certain to do something; make certain of something | Synonyms: ascertain, assure, check, control, ensure, insure, see to it |
| (verb) deliberate or decide | - |
| (verb) make sense of; assign a meaning to | Synonyms: construe, interpret |
| (verb) find out, learn, or determine with certainty, usually by making an inquiry or other effort | Synonyms: ascertain, check, determine, find out, learn, watch |
| (verb) match or meet | - |
| (verb) receive as a specified guest | - |
| (verb) imagine; conceive of; see in one's mind | Synonyms: envision, fancy, figure, image, picture, project, visualise, visualize |
| (verb) come together | Synonyms: come across, encounter, meet, run across, run into |
| (verb) conduct someone someplace | Synonyms: escort |
| (verb) perceive by sight or have the power to perceive by sight | - |
| (verb) perceive or be contemporaneous with | Synonyms: find, witness |
| (verb) see or watch | Synonyms: catch, take in, view, watch |
| (verb) see and understand, have a good eye | - |
| (verb) observe as if with an eye | - |
| (verb) undergo or live through a difficult experience | Synonyms: experience, go through |
| (verb) observe, check out, and look over carefully or inspect | Synonyms: examine |
| (verb) date regularly; have a steady relationship with | Synonyms: date, go out, go steady |
| (verb) go to see a place, as for entertainment | Synonyms: visit |
| (verb) go to see for professional or business reasons | - |
| (verb) go to see for a social visit | - |
| (verb) take charge of or deal with | Synonyms: attend, look, take care |
| seeable | (adjective) capable of being seen; or open to easy view | Synonyms: visible |
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| seed | (noun) the thick white fluid containing spermatozoa that is ejaculated by the male genital tract | Synonyms: come, cum, ejaculate, semen, seminal fluid |
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| (noun) anything that provides inspiration for later work | Synonyms: germ, source |
| (noun) one of the outstanding players in a tournament | Synonyms: seeded player |
| (noun) a small hard fruit | - |
| (noun) a mature fertilized plant ovule consisting of an embryo and its food source and having a protective coat or testa | - |
| (verb) inoculate with microorganisms | - |
| (verb) remove the seeds from | - |
| (verb) sprinkle with silver iodide particles to disperse and cause rain | - |
| (verb) distribute (players or teams) so that outstanding teams or players will not meet in the early rounds | - |
| (verb) go to seed; shed seeds | - |
| (verb) place (seeds) in or on the ground for future growth | Synonyms: sow |
| (verb) bear seeds | - |
| (verb) help (an enterprise) in its early stages of development by providing seed money | - |
| seedbed | (noun) a bed where seedlings are grown before transplanting | - |
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| seedcake | (noun) a sweet cake flavored with sesame or caraway seeds and lemon | Synonyms: seed cake |
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| seedcase | (noun) the vessel that contains the seeds of a plant (not the seeds themselves) | Synonyms: cod, pod |
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| seeded | (adjective) (of the more skilled contestants) selectively arranged in the draw for position in a tournament so that they meet each other in later rounds | - |
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| (adjective) sprinkled with seed | Synonyms: sown |
| (adjective) having or supplied with seeds | - |
| (adjective) having seeds as specified | - |
| (adjective) having the seeds extracted | - |
| seeder | (noun) a kitchen utensil that removes seeds from fruit | - |
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| (noun) a mechanical device that sows grass seed or grain evenly over the ground | - |
| (noun) a person who seeds clouds | Synonyms: cloud seeder |
| seediness | (noun) a lack of elegance as a consequence of wearing threadbare or dirty clothing | Synonyms: manginess, shabbiness, sleaziness |
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| seedless | (adjective) lacking seeds | - |
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| seedling | (noun) young plant or tree grown from a seed | - |
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| seedman | (noun) a dealer in seeds | Synonyms: seedsman |
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| seedpod | (noun) a several-seeded dehiscent fruit as e.g. of a leguminous plant | Synonyms: pod |
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| seedsman | (noun) a dealer in seeds | Synonyms: seedman |
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| seedtime | (noun) the time during which seeds should be planted | - |
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| (noun) any time of new development | - |
| seedy | (adjective) full of seeds | - |
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| (adjective) morally degraded | Synonyms: seamy, sleazy, sordid, squalid |
| (adjective) somewhat ill or prone to illness | Synonyms: ailing, indisposed, peaked, poorly, sickly, under the weather, unwell |
| (adjective) shabby and untidy | Synonyms: scruffy |
| seeing | (adjective) having vision, not blind | - |
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| (noun) normal use of the faculty of vision | Synonyms: eyesight, sightedness |
| (noun) perception by means of the eyes | Synonyms: beholding, visual perception |
| seek | (noun) the movement of a read/write head to a specific data track on a disk | - |
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| (verb) inquire for | - |
| (verb) try to locate or discover, or try to establish the existence of | Synonyms: look for, search |
| (verb) go to or towards | - |
| (verb) try to get or reach | - |
| (verb) make an effort or attempt | Synonyms: assay, attempt, essay, try |
| seeker | (noun) a missile equipped with a device that is attracted toward some kind of emission (heat or light or sound or radio waves) | - |
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| (noun) someone making a search or inquiry | Synonyms: quester, searcher |
| seeking | (noun) the act of searching for something | Synonyms: quest |
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| (noun) an attempt to acquire or gain something | - |
| seel | (verb) sew up the eyelids of hawks and falcons | - |
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| seem | (verb) give a certain impression of being something or having a certain aspect | Synonyms: appear, look |
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| (verb) (of a proposition) seem to be true, probable, or apparent | Synonyms: appear |