| abiogenesis | (noun) a hypothetical organic phenomenon by which living organisms are created from nonliving matter | Synonyms: autogenesis, autogeny, spontaneous generation |
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| abiogenist | (noun) a believer in abiogenesis | - |
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| abnegation | (noun) renunciation of your own interests in favor of the interests of others | Synonyms: denial, self-abnegation, self-denial, self-renunciation |
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| (noun) the denial and rejection of a doctrine or belief | - |
| abnegator | (noun) one who gives up or relinquishes or renounces something | - |
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| aboriginal | (noun) an indigenous person who was born in a particular place | Synonyms: aborigine, indigen, indigene, native |
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| aborigine | (noun) an indigenous person who was born in a particular place | Synonyms: aboriginal, indigen, indigene, native |
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| abridgement | (noun) a shortened version of a written work | Synonyms: abridgment, capsule, condensation |
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| abridger | (noun) one who shortens or abridges or condenses a written work | Synonyms: abbreviator |
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| abridgment | (noun) a shortened version of a written work | Synonyms: abridgement, capsule, condensation |
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| abrogation | (noun) the act of abrogating; an official or legal cancellation | Synonyms: annulment, repeal |
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| abrogator | (noun) an authority or official empowered to abolish or annul or repeal | - |
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| acanthopterygian | (noun) a teleost fish with fins that are supported by sharp inflexible rays | Synonyms: spiny-finned fish |
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| accenting | (noun) the act of giving special importance or significance to something | Synonyms: accentuation, emphasizing |
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| accounting | (noun) the occupation of maintaining and auditing records and preparing financial reports for a business | Synonyms: accountancy |
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| (noun) a system that provides quantitative information about finances | - |
| (noun) a convincing explanation that reveals basic causes | - |
| (noun) a statement of recent transactions and the resulting balance | Synonyms: account, account statement |
| (noun) a bookkeeper's chronological list of related debits and credits of a business; forms part of a ledger of accounts | Synonyms: accounting system, method of accounting |
| aching | (noun) a dull persistent (usually moderately intense) pain | Synonyms: ache |
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| acknowledgement | (noun) a statement acknowledging something or someone | Synonyms: acknowledgment |
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| (noun) the state or quality of being recognized or acknowledged | Synonyms: acknowledgment, recognition |
| acknowledgment | (noun) a statement acknowledging something or someone | Synonyms: acknowledgement |
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| (noun) a short note recognizing a source of information or of a quoted passage | Synonyms: citation, cite, credit, mention, quotation, reference |
| (noun) the state or quality of being recognized or acknowledged | Synonyms: acknowledgement, recognition |
| acquiring | (noun) the act of acquiring something | Synonyms: getting |
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| acreage | (noun) an area of ground used for some particular purpose (such as building or farming) | Synonyms: land area |
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| acrogen | (noun) any flowerless plant such as a fern (pteridophyte) or moss (bryophyte) in which growth occurs only at the tip of the main stem | - |
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| acromegalia | (noun) enlargement of bones of hands and feet and face; often accompanied by headache and muscle pain and emotional disturbances; caused by overproduction of growth hormone by the anterior pituitary gland (due to a tumor) | Synonyms: acromegaly |
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| acromegaly | (noun) enlargement of bones of hands and feet and face; often accompanied by headache and muscle pain and emotional disturbances; caused by overproduction of growth hormone by the anterior pituitary gland (due to a tumor) | Synonyms: acromegalia |
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| acting | (noun) the performance of a part or role in a drama | Synonyms: performing, playacting, playing |
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| activating | (noun) the activity of causing to have energy and be active | Synonyms: activation, energizing |
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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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| adage | (noun) a condensed but memorable saying embodying some important fact of experience that is taken as true by many people | Synonyms: byword, proverb, saw |
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| adagio | (noun) a slow section of a pas de deux requiring great skill and strength by the dancers | - |
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| (noun) (music) a composition played in adagio tempo (slowly and gracefully) | - |
| adducing | (noun) citing as evidence or proof | - |
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| adelgid | (noun) any of various insects that feed and form galls on conifers | - |
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| adenomegaly | (noun) gland enlargement | - |
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| adoxography | (noun) fine writing in praise of trivial or base subjects | - |
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| adrenergic | (noun) drug that has the effects of epinephrine | Synonyms: adrenergic drug |
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| adulting | (noun) acting like an adult | - |
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| advantage | (noun) the quality of having a superior or more favorable position | Synonyms: vantage |
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| (noun) benefit resulting from some event or action | Synonyms: reward |
| (noun) (tennis) first point scored after deuce | - |
| advantageousness | (noun) the quality of being encouraging or promising of a successful outcome | Synonyms: favorableness, favourableness, positiveness, positivity, profitableness |
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| advertising | (noun) the business of drawing public attention to goods and services | Synonyms: merchandising, publicizing |
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| (noun) a public promotion of some product or service | Synonyms: ad, advert, advertisement, advertizement, advertizing |
| advertizing | (noun) a public promotion of some product or service | Synonyms: ad, advert, advertisement, advertising, advertizement |
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| aegir | (noun) a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary) | Synonyms: bore, eager, eagre, tidal bore |
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| aegis | (noun) kindly endorsement and guidance | Synonyms: auspices, protection |
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| (noun) armor plate that protects the chest; the front part of a cuirass | Synonyms: breastplate, egis |
| aerodontalgia | (noun) pain in the teeth that results from a change in air pressure (as in flying or mountain climbing) | - |
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| aerogenerator | (noun) generator that extracts usable energy from winds | Synonyms: wind generator, windmill |
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| aerogram | (noun) a letter sent by air mail | Synonyms: aerogramme, air letter, airmail letter |
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| aerogramme | (noun) a letter sent by air mail | Synonyms: aerogram, air letter, airmail letter |
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| aerology | (noun) meteorology of the total extent of the atmosphere; especially the upper layers | - |
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| aerophagia | (noun) swallowing air (usually followed by belching and discomfort and flatulence) | - |
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| aetiologist | (noun) a specialist in the etiology of diseases | Synonyms: etiologist |
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| aetiology | (noun) the philosophical study of causation | Synonyms: etiology |
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| (noun) the cause of a disease | Synonyms: etiology |
| affright | (noun) an overwhelming feeling of fear and anxiety | Synonyms: panic, terror |
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| afghan | (noun) a blanket knitted or crocheted in strips or squares; sometimes used as a shawl | - |
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| (noun) a coat made of sheepskin | Synonyms: sheepskin coat |
| afghani | (noun) the basic unit of money in Afghanistan | - |
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| afibrinogenemia | (noun) the absence of fibrinogen in the plasma leading to prolonged bleeding | - |
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| afterglow | (noun) the pleasure of remembering some pleasant event | - |
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| (noun) a glow sometimes seen in the sky after sunset | - |
| afterimage | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: aftersensation |
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| afterthought | (noun) an addition that was not included in the original plan | - |
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| (noun) thinking again about a choice previously made | Synonyms: reconsideration, rethink, second thought |
| agal | (noun) a cord (usually of goat's hair) that Arabs (especially Bedouins) wind around their heads to hold down the kaffiyeh | - |
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| agalactia | (noun) a condition in which milk is not secreted in the mother's breasts after her child has been delivered | Synonyms: agalactosis |
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| agalactosis | (noun) a condition in which milk is not secreted in the mother's breasts after her child has been delivered | Synonyms: agalactia |
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| agama | (noun) small terrestrial lizard of warm regions of the Old World | - |
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| agamete | (noun) an asexual reproductive cell | - |
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| agamid | (noun) a lizard of the family Agamidae | Synonyms: agamid lizard |
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| agammaglobulinemia | (noun) a rare immunological disorder characterized by the virtual absence of gamma globulin in the blood and consequent susceptibility to infection | - |
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| agamogenesis | (noun) reproduction without the fusion of gametes | Synonyms: asexual reproduction |
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| agapanthus | (noun) any of various plants of the genus Agapanthus having umbels of showy blue to purple flowers | Synonyms: lily of the Nile |
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| agape | (noun) a religious meal shared as a sign of love and fellowship | Synonyms: love feast |
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| (noun) selfless love of one person for another without sexual implications (especially love that is spiritual in nature) | Synonyms: agape love |
| (noun) (Christian theology) the love of God or Christ for mankind | - |
| agar | (noun) a colloidal extract of algae; used especially in culture media and as a gelling agent in foods | Synonyms: agar-agar |
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| (noun) any culture medium that uses agar as the gelling agent | Synonyms: nutrient agar |
| agaric | (noun) a saprophytic fungus of the order Agaricales having an umbrellalike cap with gills on the underside | - |
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| (noun) fungus used in the preparation of punk for fuses | Synonyms: Fomes igniarius |
| agate | (noun) an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles | - |
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| agateware | (noun) pottery that is veined and mottled to resemble agate | - |
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| agave | (noun) tropical American plants with basal rosettes of fibrous sword-shaped leaves and flowers in tall spikes; some cultivated for ornament or for fiber | Synonyms: American aloe, century plant |
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| age | (noun) how long something has existed | - |
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| (noun) a time of life (usually defined in years) at which some particular qualification or power arises | Synonyms: eld |
| (noun) a late time of life | Synonyms: eld, geezerhood, old age, years |
| (noun) an era of history having some distinctive feature | Synonyms: historic period |
| (noun) a prolonged period of time | Synonyms: long time, years |
| aged | (noun) people who are old collectively | Synonyms: elderly |
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| agedness | (noun) the property characteristic of old age | Synonyms: senescence |
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| ageing | (noun) the organic process of growing older and showing the effects of increasing age | Synonyms: aging, senescence |
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| (noun) acquiring desirable qualities by being left undisturbed for some time | Synonyms: aging, ripening |
| ageism | (noun) discrimination on the basis of a person's age | Synonyms: agism |
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| agelessness | (noun) the quality of being timeless and eternal | - |
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| agency | (noun) to have the ability to produce a particular effect or achieve an end | Synonyms: means, way |
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| (noun) an administrative unit of government | Synonyms: authority, bureau, federal agency, government agency, office |
| (noun) a business or organization that provides a particular service, especially the mediation of transactions between two parties | - |
| (noun) the state of serving as an official and authorized delegate or agent | Synonyms: delegacy, representation |
| (noun) the state of being in action or exerting power | - |
| agenda | (noun) a temporally organized plan for matters to be attended to | Synonyms: docket, schedule |
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| (noun) a list of matters to be taken up (as at a meeting) | Synonyms: agendum, order of business |
| agendum | (noun) a list of matters to be taken up (as at a meeting) | Synonyms: agenda, order of business |
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| agenesia | (noun) imperfect development; nondevelopment of a part | Synonyms: agenesis |
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| agenesis | (noun) imperfect development; nondevelopment of a part | Synonyms: agenesia |
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| agent | (noun) the semantic role of the animate entity that instigates or causes the happening denoted by the verb in the clause | Synonyms: agentive role |
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| (noun) an active and efficient cause; capable of producing a certain effect | - |
| (noun) a businessman who buys or sells for another in exchange for a commission | Synonyms: broker, factor |
| (noun) a representative who acts on behalf of other persons or organizations | - |
| (noun) any agent or representative of a federal agency or bureau | Synonyms: federal agent |
| (noun) a substance that exerts some force or effect | - |
| agerasia | (noun) youthful appearance in an old person | - |
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| ageratum | (noun) any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers | - |
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| (noun) rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium | Synonyms: Conoclinium coelestinum, Eupatorium coelestinum, mist-flower, mistflower |
| agglomerate | (noun) a collection of objects laid on top of each other | Synonyms: cumulation, cumulus, heap, mound, pile |
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| (noun) volcanic rock consisting of large fragments fused together | - |
| agglomeration | (noun) the act of collecting in a mass; the act of agglomerating | - |
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| (noun) a jumbled collection or mass | - |
| agglomerator | (noun) a device that causes material to gather into rounded balls | - |
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| agglutination | (noun) the building of words from component morphemes that retain their form and meaning in the process of combining | - |
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| (noun) a clumping of bacteria or red cells when held together by antibodies (agglutinins) | - |
| (noun) the coalescing of small particles that are suspended in solution; these larger masses are then (usually) precipitated | Synonyms: agglutinating activity |
| agglutinin | (noun) an antibody that causes agglutination of a specific antigen | - |
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| agglutinogen | (noun) any substance that acts as an antigen to cause agglutinin production | - |
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| aggrandisement | (noun) the act of increasing the wealth or prestige or power or scope of something | Synonyms: aggrandizement, elevation |
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| aggrandizement | (noun) the act of increasing the wealth or prestige or power or scope of something | Synonyms: aggrandisement, elevation |
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| aggravation | (noun) unfriendly behavior that causes anger or resentment | Synonyms: irritation, provocation |
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| (noun) action that makes a problem or a disease (or its symptoms) worse | Synonyms: exacerbation |
| (noun) an exasperated feeling of annoyance | Synonyms: exasperation |
| aggravator | (noun) an unpleasant person who is annoying or exasperating | Synonyms: annoyance |
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| aggregate | (noun) the whole amount | Synonyms: sum, total, totality |
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| (noun) a sum total of many heterogenous things taken together | Synonyms: congeries, conglomeration |
| (noun) material such as sand or gravel used with cement and water to make concrete, mortar, or plaster | - |
| aggregation | (noun) the act of gathering something together | Synonyms: assembling, collecting, collection |
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| (noun) several things grouped together or considered as a whole | Synonyms: accumulation, assemblage, collection |
| aggregator | (noun) a person who collects things | Synonyms: collector |
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| aggression | (noun) violent action that is hostile and usually unprovoked | Synonyms: hostility |
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| (noun) deliberately unfriendly behavior | - |
| (noun) the act of initiating hostilities | - |
| (noun) a disposition to behave aggressively | - |
| (noun) a feeling of hostility that arouses thoughts of attack | Synonyms: aggressiveness |
| aggressiveness | (noun) the quality of being bold and enterprising | - |
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| (noun) a natural disposition to be hostile | Synonyms: belligerence, pugnacity |
| (noun) a feeling of hostility that arouses thoughts of attack | Synonyms: aggression |
| aggressor | (noun) someone who attacks | Synonyms: assailant, assaulter, attacker |
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| (noun) a confident assertive person who acts as instigator | - |
| aggro | (noun) (informal British usage) aggravation or aggression | - |
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