| allochronic | (adjective) (of taxa) occurring in different geologic times | - |
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| allochthonous | (adjective) of rocks, deposits, etc.; found in a place other than where they and their constituents were formed | - |
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| allocution | (noun) (rhetoric) a formal or authoritative address that advises or exhorts | - |
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| allophone | (noun) (linguistics) any of various acoustically different forms of the same phoneme | - |
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| allophonic | (adjective) pertaining to allophones | - |
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| allusion | (noun) passing reference or indirect mention | - |
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| alluviation | (noun) the phenomenon of sediment or gravel accumulating | Synonyms: deposit, sedimentation |
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| alluvion | (noun) clay or silt or gravel carried by rushing streams and deposited where the stream slows down | Synonyms: alluvial deposit, alluvial sediment, alluvium |
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| (noun) the rising of a body of water and its overflowing onto normally dry land | Synonyms: deluge, flood, inundation |
| (noun) gradual formation of new land, by recession of the sea or deposit of sediment | - |
| almond | (noun) oval-shaped edible seed of the almond tree | - |
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| (noun) small bushy deciduous tree native to Asia and North Africa having pretty pink blossoms and highly prized edible nuts enclosed in a hard green hull; cultivated in southern Australia and California | Synonyms: Amygdalus communis, Prunus amygdalus, Prunus dulcis, sweet almond |
| almoner | (noun) an official in a British hospital who looks after the social and material needs of the patients | Synonyms: medical social worker |
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| alone | (adjective) exclusive of anyone or anything else | Synonyms: only |
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| (adjective) radically distinctive and without equal | Synonyms: unequaled, unequalled, unique, unparalleled |
| (adjective) lacking companions or companionship | Synonyms: lone, lonely, solitary |
| (adjective) isolated from others | - |
| (adverb) without any others being included or involved | Synonyms: entirely, exclusively, only, solely |
| (adverb) without anybody else or anything else | Synonyms: solo, unaccompanied |
| aloneness | (noun) a disposition toward being alone | Synonyms: loneliness, lonesomeness, solitariness |
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| along | (adverb) in accompaniment or as a companion | - |
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| (adverb) with a forward motion | Synonyms: on |
| (adverb) in addition (usually followed by `with') | - |
| (adverb) to a more advanced state | - |
| (adverb) in line with a length or direction (often followed by `by' or `beside') | - |
| alongside | (adverb) side by side | Synonyms: aboard |
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| alphabetisation | (noun) the act of putting in alphabetical order | Synonyms: alphabetization |
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| alphabetization | (noun) the act of putting in alphabetical order | Synonyms: alphabetisation |
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| alteration | (noun) the act of revising or altering (involving reconsideration and modification) | Synonyms: revision |
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| (noun) the act of making something different (as e.g. the size of a garment) | Synonyms: adjustment, modification |
| (noun) an event that occurs when something passes from one state or phase to another | Synonyms: change, modification |
| altercation | (noun) noisy quarrel | Synonyms: affray, fracas |
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| alternation | (noun) successive change from one thing or state to another and back again | - |
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| amalgamation | (noun) the combination of two or more commercial companies | Synonyms: merger, uniting |
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| amazon | (noun) mainly green tropical American parrots | - |
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| (noun) a large strong and aggressive woman | Synonyms: virago |
| ambition | (noun) a strong drive for success | Synonyms: ambitiousness |
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| (noun) a cherished desire | Synonyms: aspiration, dream |
| (verb) have as one's ambition | - |
| ambitionless | (adjective) having little desire for success or achievement | Synonyms: unambitious |
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| ambiversion | (noun) (psychology) a balanced disposition intermediate between extroversion and introversion | - |
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| amblygonite | (noun) a white or grey mineral consisting of lithium aluminum phosphate; a source of lithium | - |
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| ambulation | (noun) walking about | - |
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| amelioration | (noun) the act of relieving ills and changing for the better | Synonyms: betterment, melioration |
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| amiodarone | (noun) an antiarrhythmic drug (trade name Cordarone) that has potentially fatal side effects and is used to control serious heart rhythm problems only when safer agents have been ineffective | Synonyms: Cordarone |
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| ammonal | (noun) Ammonal is an explosive made up of ammonium nitrate and aluminum powder. | - |
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| ammonia | (noun) a pungent gas compounded of nitrogen and hydrogen (NH3) | - |
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| (noun) a water solution of ammonia | Synonyms: ammonia water, ammonium hydroxide |
| ammoniac | (adjective) pertaining to or containing or similar to ammonia | Synonyms: ammoniacal |
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| (noun) the aromatic gum of the ammoniac plant | Synonyms: gum ammoniac |
| ammoniacal | (adjective) pertaining to or containing or similar to ammonia | Synonyms: ammoniac |
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| ammoniate | (verb) treat with ammonia | - |
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| ammoniated | (adjective) combined or treated with ammonia | - |
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| ammonification | (noun) impregnation with ammonia or a compound of ammonia | - |
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| ammonify | (verb) treat with ammonia; cause to undergo ammonification | - |
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| ammonite | (noun) one of the coiled chambered fossil shells of extinct mollusks | Synonyms: ammonoid |
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| ammonitic | (adjective) of or related to an order of fossil cephalopods | - |
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| ammonium | (noun) the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion | Synonyms: ammonium ion |
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| ammoniuria | (noun) excessive ammonia in the urine | - |
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| ammonoid | (noun) one of the coiled chambered fossil shells of extinct mollusks | Synonyms: ammonite |
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| ammunition | (noun) projectiles to be fired from a gun | Synonyms: ammo |
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| (noun) information that can be used to attack or defend a claim or argument or viewpoint | - |
| (noun) any nuclear or chemical or biological material that can be used as a weapon of mass destruction | - |
| amnion | (noun) thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) | Synonyms: amnios, amniotic sac |
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| amnionic | (adjective) of or related to the amnion or characterized by developing an amnion | Synonyms: amnic, amniotic |
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| amortisation | (noun) payment of an obligation in a series of installments or transfers | Synonyms: amortization |
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| (noun) the reduction of the value of an asset by prorating its cost over a period of years | Synonyms: amortization |
| amortization | (noun) payment of an obligation in a series of installments or transfers | Synonyms: amortisation |
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| (noun) the reduction of the value of an asset by prorating its cost over a period of years | Synonyms: amortisation |
| amphictyony | (noun) an association of neighboring states or tribes in ancient Greece; established originally to defend a common religious center | - |
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| amplification | (noun) (electronics) the act of increasing voltage or power or current | - |
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| (noun) addition of extra material or illustration or clarifying detail | Synonyms: elaboration |
| (noun) the amount of increase in signal power or voltage or current expressed as the ratio of output to input | Synonyms: gain |
| amputation | (noun) a surgical removal of all or part of a limb | - |
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| (noun) a condition of disability resulting from the loss of one or more limbs | - |
| amrinone | (noun) a drug (trade name Inocor) used intravenously in heart failure; increases strength of contraction of myocardium | Synonyms: Inocor |
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| amyotonia | (noun) lack of normal muscular tension or tonus | Synonyms: atonia, atonicity, atony |
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| anachronic | (adjective) chronologically misplaced | Synonyms: anachronistic, anachronous |
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| anachronism | (noun) an artifact that belongs to another time | - |
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| (noun) a person who seems to be displaced in time; who belongs to another age | - |
| (noun) something located at a time when it could not have existed or occurred | Synonyms: misdating, mistiming |
| anachronistic | (adjective) chronologically misplaced | Synonyms: anachronic, anachronous |
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| anachronistically | (adverb) in an anachronistic manner | - |
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| anachronous | (adjective) chronologically misplaced | Synonyms: anachronic, anachronistic |
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| anacoluthon | (noun) an abrupt change within a sentence from one syntactic structure to another | Synonyms: anacoluthia |
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| anaconda | (noun) large arboreal boa of tropical South America | Synonyms: Eunectes murinus |
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| anathematisation | (noun) the formal act of pronouncing (someone or something) accursed | Synonyms: anathematization |
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| anathematization | (noun) the formal act of pronouncing (someone or something) accursed | Synonyms: anathematisation |
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| anchorperson | (noun) a television reporter who coordinates a broadcast to which several correspondents contribute | Synonyms: anchor, anchorman |
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| andiron | (noun) metal supports for logs in a fireplace | Synonyms: dog-iron, dog, firedog |
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| androsterone | (noun) an androgenic hormone that is less active than testosterone | - |
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| anemone | (noun) marine polyps that resemble flowers but have oral rings of tentacles; differ from corals in forming no hard skeleton | Synonyms: sea anemone |
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| (noun) any woodland plant of the genus Anemone grown for its beautiful flowers and whorls of dissected leaves | Synonyms: windflower |
| angiotonin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotensin, Hypertensin |
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| angulation | (noun) the act of making angulate (having corners) | - |
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| (noun) the precise measurement of angles | - |
| anhedonia | (noun) an inability to experience pleasure | - |
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| animadversion | (noun) harsh criticism or disapproval | Synonyms: censure |
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| animalisation | (noun) an act that makes people cruel or lacking normal human qualities | Synonyms: animalization, brutalisation, brutalization |
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| animalization | (noun) an act that makes people cruel or lacking normal human qualities | Synonyms: animalisation, brutalisation, brutalization |
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| (noun) a depiction in the form of an animal | - |
| animation | (noun) the making of animated cartoons | - |
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| (noun) general activity and motion | Synonyms: liveliness |
| (noun) the activity of giving vitality and vigour to something | Synonyms: invigoration, vivification |
| (noun) the property of being able to survive and grow | Synonyms: vitality |
| (noun) quality of being active or spirited or alive and vigorous | Synonyms: brio, invigoration, spiritedness, vivification |
| (noun) the condition of living or the state of being alive | Synonyms: aliveness, life, living |
| animatronics | (noun) the construction of robots to look like animals (developed for Disneyland) | - |
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| anion | (noun) a negatively charged ion | - |
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| anionic | (adjective) of or relating to anions | - |
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| (noun) a class of synthetic detergents in which the molecules do not ionize in aqueous solutions | Synonyms: anionic detergent, non-ionic detergent |
| aniseikonia | (noun) visual defect in which the shape and size of an ocular image differ in the two eyes | - |
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| aniseikonic | (adjective) relating to or characteristic of the visual defect aniseikonia | - |
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| anklebone | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: astragal, astragalus, talus |
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| annexation | (noun) the formal act of acquiring something (especially territory) by conquest or occupation | - |
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| (noun) incorporation by joining or uniting | Synonyms: appropriation |
| annexational | (adjective) relating to annexation | - |
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| annihilation | (noun) destruction by annihilating something | Synonyms: obliteration |
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| (noun) total destruction | Synonyms: disintegration |
| annon | (noun) sweet pulpy tropical fruit with thick scaly rind and shiny black seeds | Synonyms: sugar apple, sweetsop |
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| annotation | (noun) the act of adding notes | Synonyms: annotating |
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| (noun) a comment or instruction (usually added) | Synonyms: notation, note |
| annunciation | (noun) a formal public statement | Synonyms: announcement, declaration, proclamation |
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| anon | (adverb) (old-fashioned or informal) in a little while | - |
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| (adverb) at another time | - |
| anonym | (noun) a fictitious name used when the person performs a particular social role | Synonyms: nom de guerre, pseudonym |
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| anonymity | (noun) the state of being anonymous | Synonyms: namelessness |
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| anonymous | (adjective) having no known name or identity or known source | Synonyms: anon. |
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| (adjective) not known or lacking marked individuality | - |
| anonymously | (adverb) without giving a name | - |
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| anovulation | (noun) the absence of ovulation due to immaturity or post-maturity or pregnancy or oral contraceptive pills or dysfunction of the ovary | - |
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| antagonise | (verb) provoke the hostility of | Synonyms: antagonize |
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| (verb) act in opposition to | Synonyms: antagonize, counteract |
| antagonism | (noun) (biochemistry) interference in or inhibition of the physiological action of a chemical substance by another having a similar structure | - |
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| (noun) an actively expressed feeling of dislike and hostility | - |
| (noun) the relation between opposing principles or forces or factors | - |
| (noun) a state of deep-seated ill-will | Synonyms: enmity, hostility |
| antagonist | (noun) a drug that neutralizes or counteracts the effects of another drug | - |
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| (noun) a muscle that relaxes while another contracts | - |
| (noun) someone who offers opposition | Synonyms: adversary, opponent, opposer, resister |
| antagonistic | (adjective) arousing animosity or hostility | - |
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| (adjective) used especially of drugs or muscles that counteract or neutralize each other's effect | Synonyms: incompatible |
| (adjective) characterized by antagonism or antipathy | Synonyms: antipathetic, antipathetical |
| (adjective) incapable of harmonious association | - |
| (adjective) indicating opposition or resistance | Synonyms: counter |
| antagonistically | (adverb) in an antagonistic manner | - |
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| antagonize | (verb) provoke the hostility of | Synonyms: antagonise |
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| (verb) act in opposition to | Synonyms: antagonise, counteract |
| antibaryon | (noun) the antiparticle of a baryon; a hadron with a baryon number of -1 | - |
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| anticipation | (noun) the act of predicting (as by reasoning about the future) | Synonyms: prediction, prevision |
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| (noun) something expected (as on the basis of a norm) | Synonyms: expectancy |
| (noun) an expectation | Synonyms: expectancy |
| (noun) anticipating with confidence of fulfillment | Synonyms: expectation |
| anticoagulation | (noun) the administration of an anticoagulant drug to retard coagulation of the blood | - |
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| anticonvulsant | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant drug, antiepileptic, antiepileptic drug |
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| anticyclone | (noun) (meteorology) winds spiraling outward from a high pressure center; circling clockwise in the Northern Hemisphere and counterclockwise in the southern | - |
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