| acetylate | (verb) receive substitution of an acetyl group | Synonyms: acetylise, acetylize |
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| (verb) introduce an acetyl group into (a chemical compound) | Synonyms: acetylise, acetylize |
| acetylation | (noun) the process of introducing an acetyl group into a compound | - |
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| acetylcholine | (noun) a neurotransmitter that is a derivative of choline; released at the ends of nerve fibers in the somatic and parasympathetic nervous systems | - |
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| acetylene | (noun) a colorless flammable gas used chiefly in welding and in organic synthesis | Synonyms: alkyne, ethyne |
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| acetylenic | (adjective) of or related to acetylene | - |
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| acetylic | (adjective) of or related to acetic acid | - |
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| acetylise | (verb) receive substitution of an acetyl group | Synonyms: acetylate, acetylize |
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| (verb) introduce an acetyl group into (a chemical compound) | Synonyms: acetylate, acetylize |
| acetylize | (verb) receive substitution of an acetyl group | Synonyms: acetylate, acetylise |
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| (verb) introduce an acetyl group into (a chemical compound) | Synonyms: acetylate, acetylise |
| acquaintance | (noun) personal knowledge or information about someone or something | Synonyms: conversance, conversancy, familiarity |
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| (noun) a person with whom you are acquainted | Synonyms: friend |
| (noun) a relationship less intimate than friendship | Synonyms: acquaintanceship |
| acquaintanceship | (noun) a relationship less intimate than friendship | Synonyms: acquaintance |
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| acquiesce | (verb) to agree or express agreement | Synonyms: accede, assent |
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| acquiescence | (noun) agreement with a statement or proposal to do something | Synonyms: assent |
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| (noun) acceptance without protest | - |
| acquiescent | (adjective) willing to carry out the orders or wishes of another without protest | Synonyms: biddable |
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| acquittance | (noun) a legal document evidencing the discharge of a debt or obligation | Synonyms: release |
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| acrocentric | (adjective) having a subterminal centromere | - |
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| acrocephaly | (noun) a congenital abnormality of the skull; the top of the skull assumes a cone shape | Synonyms: oxycephaly |
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| actinomyces | (noun) soil-inhabiting saprophytes and disease-producing plant and animal parasites | - |
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| actinomycetal | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetous |
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| actinomycete | (noun) any bacteria (some of which are pathogenic for humans and animals) belonging to the order Actinomycetales | - |
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| actinomycetous | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetal |
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| acylglycerol | (noun) an ester of glycerol and fatty acids that occurs naturally as fats and fatty oils | Synonyms: glyceride |
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| adamance | (noun) resoluteness by virtue of being unyielding and inflexible | Synonyms: obduracy, unyieldingness |
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| adduce | (verb) advance evidence for | Synonyms: abduce, cite |
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| adducent | (adjective) especially of muscles; bringing together or drawing toward the midline of the body or toward an adjacent part | Synonyms: adducting, adductive |
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| adducer | (noun) a discussant who offers an example or a reason or a proof | - |
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| adherence | (noun) faithful support for a cause or political party or religion | Synonyms: adhesion, attachment |
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| (noun) the property of sticking together (as of glue and wood) or the joining of surfaces of different composition | Synonyms: adhesion, adhesiveness, bond |
| adience | (noun) (psychology) an urge to accept or approach a situation or an object | - |
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| adjacency | (noun) the attribute of being so near as to be touching | Synonyms: contiguity, contiguousness |
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| adjacent | (adjective) nearest in space or position; immediately adjoining without intervening space | Synonyms: next, side by side |
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| (adjective) having a common boundary or edge; abutting; touching | Synonyms: conterminous, contiguous, neighboring, neighbouring |
| (adjective) near or close to but not necessarily touching | - |
| admittance | (noun) the act of admitting someone to enter | Synonyms: admission |
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| (noun) the right to enter | Synonyms: access, accession, admission, entree |
| adolesce | (verb) become adolescent; pass through adolescence | - |
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| adolescence | (noun) in the state that someone is in between puberty and adulthood | - |
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| (noun) the time period between the beginning of puberty and adulthood | - |
| adolescent | (adjective) relating to or peculiar to or suggestive of an adolescent | - |
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| (adjective) in the state of development between puberty and maturity | - |
| (adjective) displaying or suggesting a lack of maturity | Synonyms: jejune, juvenile, puerile |
| (adjective) being of the age 13 through 19 | Synonyms: teen, teenage, teenaged |
| (noun) a juvenile between the onset of puberty and maturity | Synonyms: stripling, teen, teenager |
| advance | (adjective) being ahead of time or need | Synonyms: beforehand |
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| (adjective) situated ahead or going before | Synonyms: advanced, in advance |
| (noun) the act of moving forward (as toward a goal) | Synonyms: advancement, forward motion, onward motion, procession, progress, progression |
| (noun) increase in price or value | Synonyms: rise |
| (noun) a tentative suggestion designed to elicit the reactions of others | Synonyms: approach, feeler, overture |
| (noun) a movement forward | Synonyms: progress, progression |
| (noun) a change for the better; progress in development | Synonyms: betterment, improvement |
| (noun) an amount paid before it is earned | Synonyms: cash advance |
| (verb) develop in a positive way | Synonyms: come along, come on, get along, get on, progress, shape up |
| (verb) rise in rate or price | Synonyms: gain |
| (verb) increase or raise | Synonyms: boost, supercharge |
| (verb) develop further | - |
| (verb) bring forward for consideration or acceptance | Synonyms: throw out |
| (verb) obtain advantages, such as points, etc. | Synonyms: gain, gain ground, get ahead, make headway, pull ahead, win |
| (verb) move forward, also in the metaphorical sense | Synonyms: go on, march on, move on, pass on, progress |
| (verb) cause to move forward | Synonyms: bring forward |
| (verb) move forward | Synonyms: set ahead |
| (verb) pay in advance | - |
| (verb) give a promotion to or assign to a higher position | Synonyms: elevate, kick upstairs, promote, raise, upgrade |
| (verb) contribute to the progress or growth of | Synonyms: boost, encourage, further, promote |
| advanced | (adjective) (of societies) highly developed especially in technology or industry | - |
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| (adjective) situated ahead or going before | Synonyms: advance, in advance |
| (adjective) ahead in development; complex or intricate | Synonyms: sophisticated |
| (adjective) far along in time | Synonyms: ripe |
| (adjective) comparatively late in a course of development | - |
| (adjective) farther along in physical or mental development | - |
| (adjective) ahead of the times | Synonyms: forward-looking, innovative, modern |
| (adjective) at a higher level in training or knowledge or skill | - |
| advancement | (noun) the act of moving forward (as toward a goal) | Synonyms: advance, forward motion, onward motion, procession, progress, progression |
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| (noun) gradual improvement or growth or development | Synonyms: progress |
| (noun) encouragement of the progress or growth or acceptance of something | Synonyms: furtherance, promotion |
| advancer | (noun) someone who advances | - |
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| advertence | (noun) the process of being heedful | Synonyms: advertency |
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| advice | (noun) a proposal for an appropriate course of action | - |
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| aerospace | (noun) the atmosphere and outer space considered as a whole | - |
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| affiance | (verb) give to in marriage | Synonyms: betroth, engage, plight |
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| affluence | (noun) abundant wealth | Synonyms: richness |
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| afterpiece | (noun) a brief dramatic piece (usually comic) presented after a play | - |
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| airforce | (noun) the airborne branch of a country's armed forces | Synonyms: air force |
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| airspace | (noun) the atmosphere above a nation that is deemed to be under its jurisdiction | - |
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| (noun) the space in the atmosphere immediately above the earth | Synonyms: air space |
| albescent | (adjective) becoming or shading into white | - |
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| alcalescent | (adjective) tending to become alkaline; slightly alkaline | Synonyms: alkalescent |
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| alkalescent | (adjective) tending to become alkaline; slightly alkaline | Synonyms: alcalescent |
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| allegiance | (noun) the act of binding yourself (intellectually or emotionally) to a course of action | Synonyms: commitment, dedication, loyalty |
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| (noun) the loyalty that citizens owe to their country (or subjects to their sovereign) | Synonyms: fealty |
| alliaceous | (adjective) of or pertaining to the botanical genus Allium | - |
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| (adjective) smelling of onions or garlic | - |
| alliance | (noun) the act of forming an alliance or confederation | Synonyms: confederation |
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| (noun) a formal agreement establishing an association or alliance between nations or other groups to achieve a particular aim | - |
| (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alignment, alinement, coalition |
| (noun) a connection based on kinship or marriage or common interest | Synonyms: bond |
| (noun) the state of being allied or confederated | Synonyms: confederation |
| allice | (noun) European shad | Synonyms: allice shad, allis, allis shad, Alosa alosa |
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| allowance | (noun) the act of allowing | - |
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| (noun) a permissible difference; allowing some freedom to move within limits | Synonyms: leeway, margin, tolerance |
| (noun) an amount allowed or granted (as during a given period) | - |
| (noun) an amount added or deducted on the basis of qualifying circumstances | Synonyms: adjustment |
| (noun) a sum granted as reimbursement for expenses | - |
| (noun) a reserve fund created by a charge against profits in order to provide for changes in the value of a company's assets | Synonyms: allowance account, valuation account, valuation reserve |
| (verb) put on a fixed allowance, as of food | - |
| allspice | (noun) ground dried berrylike fruit of a West Indian allspice tree; suggesting combined flavors of cinnamon and nutmeg and cloves | - |
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| (noun) aromatic West Indian tree that produces allspice berries | Synonyms: allspice tree, Pimenta dioica, pimento tree |
| (noun) deciduous shrubs having aromatic bark; eastern China; southwestern and eastern United States | - |
| altarpiece | (noun) a painted or carved screen placed above and behind an altar or communion table | Synonyms: reredos |
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| ambiance | (noun) the atmosphere of an environment | Synonyms: ambience |
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| (noun) a particular environment or surrounding influence | Synonyms: ambience, atmosphere |
| ambience | (noun) the atmosphere of an environment | Synonyms: ambiance |
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| (noun) a particular environment or surrounding influence | Synonyms: ambiance, atmosphere |
| ambivalence | (noun) mixed feelings or emotions | Synonyms: ambivalency |
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| amboceptor | (noun) an immune body formed in the blood during infection or immunization that serves to link the complement to the antigen. | - |
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| ambulance | (noun) a vehicle that takes people to and from hospitals | - |
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| amentaceous | (adjective) (of plants) bearing or characterized by aments or catkins | Synonyms: amentiferous |
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| amerce | (verb) punish with an arbitrary penalty | - |
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| (verb) punish by a fine imposed arbitrarily by the discretion of the court | - |
| amercement | (noun) money extracted as a penalty | Synonyms: fine, mulct |
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| amniocentesis | (noun) (pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalities | Synonyms: amnio |
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| amylaceous | (adjective) resembling starch | Synonyms: amyloid, amyloidal, farinaceous, starchlike |
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| ancestor | (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: antecedent, ascendant, ascendent, root |
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| ancestral | (adjective) of or belonging to or inherited from an ancestor | - |
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| (adjective) inherited or inheritable by established rules (usually legal rules) of descent | Synonyms: hereditary, patrimonial, transmissible |
| ancestress | (noun) a woman ancestor | - |
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| ancestry | (noun) inherited properties shared with others of your bloodline | Synonyms: derivation, filiation, lineage |
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| (noun) the hereditary derivation of an individual | Synonyms: blood, blood line, bloodline, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| anencephalia | (noun) a defect in brain development resulting in small or missing brain hemispheres | Synonyms: anencephaly |
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| anencephalic | (adjective) characterized by partial or total absence of a brain | Synonyms: anencephalous |
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| anencephalous | (adjective) characterized by partial or total absence of a brain | Synonyms: anencephalic |
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| anencephaly | (noun) a defect in brain development resulting in small or missing brain hemispheres | Synonyms: anencephalia |
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| announce | (verb) make known; make an announcement | Synonyms: denote |
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| (verb) foreshadow or presage | Synonyms: annunciate, foretell, harbinger, herald |
| (verb) announce publicly or officially | Synonyms: declare |
| (verb) give the names of | - |
| announced | (adjective) declared publicly; made widely known | Synonyms: proclaimed |
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| announcement | (noun) a public statement containing information about an event that has happened or is going to happen | Synonyms: promulgation |
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| (noun) a formal public statement | Synonyms: annunciation, declaration, proclamation |
| announcer | (noun) reads news, commercials on radio or television | - |
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| (noun) someone who proclaims a message publicly | - |
| annoyance | (noun) the act of troubling or annoying someone | Synonyms: annoying, irritation, vexation |
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| (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: bother, botheration, infliction, nuisance, pain, pain in the ass, pain in the neck |
| (noun) anger produced by some annoying irritation | Synonyms: chafe, vexation |
| (noun) an unpleasant person who is annoying or exasperating | Synonyms: aggravator |
| (noun) the psychological state of being irritated or annoyed | Synonyms: botheration, irritation, vexation |
| antecede | (verb) be earlier in time; go back further | Synonyms: antedate, forego, forgo, precede, predate |
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| antecedence | (noun) preceding in time | Synonyms: antecedency, anteriority, precedence, precedency, priority |
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| antecedency | (noun) preceding in time | Synonyms: antecedence, anteriority, precedence, precedency, priority |
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| antecedent | (adjective) preceding in time or order | - |
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| (noun) the referent of an anaphor; a phrase or clause that is referred to by an anaphoric pronoun | - |
| (noun) a preceding occurrence or cause or event | - |
| (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, ascendant, ascendent, root |
| (noun) anything that precedes something similar in time | Synonyms: forerunner |
| antecedently | (adverb) at an earlier time or formerly | Synonyms: previously |
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| anthropocentric | (adjective) human-centered | - |
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| anthropocentricity | (noun) an inclination to evaluate reality exclusively in terms of human values | Synonyms: anthropocentrism |
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| anthropocentrism | (noun) an inclination to evaluate reality exclusively in terms of human values | Synonyms: anthropocentricity |
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| anticancer | (adjective) used in the treatment of cancer | Synonyms: antineoplastic, antitumor, antitumour |
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| anyplace | (adverb) at or in or to any place | Synonyms: anywhere |
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| apace | (adverb) with speed | Synonyms: chop-chop, in short order, quickly, rapidly, speedily |
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| (adverb) (poetic, literary) quickly | - |
| apiece | (adverb) to or from every one of two or more (considered individually) | Synonyms: each, for each one, from each one, to each one |
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| aplacental | (adjective) having no placenta | - |
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| apocynaceous | (adjective) of or relating to tropical plants of the family Apocynaceae | - |
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| appearance | (noun) the act of appearing in public view | - |
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| (noun) formal attendance (in court or at a hearing) of a party in an action | Synonyms: appearing, coming into court |
| (noun) pretending that something is the case in order to make a good impression | Synonyms: show |
| (noun) outward or visible aspect of a person or thing | Synonyms: visual aspect |
| (noun) a mental representation | - |
| (noun) the event of coming into sight | - |
| appendicectomy | (noun) surgical removal of the vermiform appendix | Synonyms: appendectomy |
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| apperceive | (verb) perceive in terms of a past experience | - |
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| apperception | (noun) the process whereby perceived qualities of an object are related to past experience | - |
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| apperceptive | (adjective) able to relate new percepts to past experience | - |
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| appetence | (noun) a feeling of craving something | Synonyms: appetency, appetite |
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| applesauce | (noun) nonsensical talk or writing | Synonyms: codswallop, folderol, rubbish, trash, tripe, trumpery, wish-wash |
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| (noun) puree of stewed apples usually sweetened and spiced | Synonyms: apple sauce |
| appliance | (noun) durable goods for home or office use | - |
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| (noun) a device or control that is very useful for a particular job | Synonyms: contraption, contrivance, convenience, gadget, gismo, gizmo, widget |