| sec | (noun) ratio of the hypotenuse to the adjacent side of a right-angled triangle | Synonyms: secant |
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| (noun) 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites | Synonyms: s, second |
| secant | (noun) ratio of the hypotenuse to the adjacent side of a right-angled triangle | Synonyms: sec |
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| (noun) a straight line that intersects a curve at two or more points | - |
| secateurs | (noun) small pruning shears with a spring that holds the handles open and a single blade that closes against a flat surface | - |
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| secernment | (noun) the cognitive process whereby two or more stimuli are distinguished | Synonyms: discrimination |
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| (noun) the organic process of synthesizing and releasing some substance | Synonyms: secretion |
| secession | (noun) formal separation from an alliance or federation | Synonyms: withdrawal |
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| (noun) an Austrian school of art and architecture parallel to the French art nouveau in the 1890s | Synonyms: sezession |
| secessionism | (noun) a doctrine that maintains the right of secession | - |
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| secessionist | (noun) an advocate of secessionism | - |
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| seckel | (noun) small yellowish- to reddish-brown pear | Synonyms: seckel pear |
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| seclusion | (noun) the act of secluding yourself from others | - |
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| (noun) the quality of being secluded from the presence or view of others | Synonyms: privacy, privateness |
| secobarbital | (noun) barbiturate that is a white odorless slightly bitter powder (trade name Seconal) used as a sodium salt for sedation and to treat convulsions | Synonyms: red devil, secobarbital sodium, Seconal |
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| second | (noun) the fielding position of the player on a baseball team who is stationed near the second of the bases in the infield | Synonyms: second base |
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| (noun) the gear that has the second lowest forward gear ratio in the gear box of a motor vehicle | Synonyms: second gear |
| (noun) merchandise that has imperfections; usually sold at a reduced price without the brand name | Synonyms: irregular |
| (noun) a speech seconding a motion | Synonyms: endorsement, indorsement, secondment |
| (noun) the official attendant of a contestant in a duel or boxing match | - |
| (noun) a 60th part of a minute of arc | Synonyms: arcsecond |
| (noun) following the first in an ordering or series | - |
| (noun) 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites | Synonyms: s, sec |
| (noun) an indefinitely short time | Synonyms: bit, minute, mo, moment |
| (noun) a particular point in time | Synonyms: instant, minute, moment |
| secondary | (noun) coil such that current is induced in it by passing a current through the primary coil | Synonyms: secondary coil, secondary winding |
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| (noun) the defensive football players who line up behind the linemen | - |
| seconder | (noun) someone who endorses a motion or petition as a necessary preliminary to a discussion or vote | - |
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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 | (noun) something that baffles understanding and cannot be explained | Synonyms: closed book, enigma, mystery |
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| (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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| 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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| 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 |
| 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 |
| 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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| 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 | (noun) a member of a sect | Synonyms: sectarist, sectary |
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| 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 | - |
| sectional | (noun) a piece of furniture made up of sections that can be arranged individually or together | - |
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| 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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| 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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| 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 | - |
| secular | (noun) someone who is not a clergyman or a professional person | Synonyms: layman, layperson |
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| 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 |
| 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 |
| secundigravida | (noun) a woman who is pregnant for the second time | Synonyms: gravida II |
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| 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 | - |