| abasement | (noun) depriving one of self-esteem | Synonyms: humiliation |
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| (noun) a low or downcast state | Synonyms: abjection, degradation |
| abseil | (noun) (mountaineering) a descent of a vertical cliff or wall made by using a doubled rope that is fixed to a higher point and wrapped around the body | Synonyms: rappel |
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| abseiler | (noun) a person who descends down a nearly vertical face by using a doubled rope that is wrapped around the body and attached to some high point | Synonyms: rappeller |
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| absence | (noun) failure to be present | - |
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| (noun) the state of being absent | - |
| (noun) the occurrence of an abrupt, transient loss or impairment of consciousness (which is not subsequently remembered), sometimes with light twitching, fluttering eyelids, etc.; common in petit mal epilepsy | Synonyms: absence seizure |
| (noun) the time interval during which something or somebody is away | - |
| absentee | (noun) one that is absent or not in residence | - |
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| absenteeism | (noun) habitual absence from work | - |
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| absentmindedness | (noun) preoccupation so great that the ordinary demands on attention are ignored | - |
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| abstruseness | (noun) the quality of being unclear or abstruse and hard to understand | Synonyms: obscureness, obscurity, reconditeness |
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| (noun) wisdom that is recondite and abstruse and profound | Synonyms: abstrusity, profoundness, profundity, reconditeness |
| abuse | (noun) improper or excessive use | Synonyms: misuse |
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| (noun) cruel or inhumane treatment | Synonyms: ill-treatment, ill-usage, maltreatment |
| (noun) a rude expression intended to offend or hurt | Synonyms: contumely, insult, revilement, vilification |
| abuser | (noun) someone who abuses | Synonyms: maltreater |
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| accoucheuse | (noun) a woman skilled in aiding the delivery of babies | Synonyms: midwife |
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| accused | (noun) a defendant in a criminal proceeding | - |
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| accuser | (noun) someone who imputes guilt or blame | - |
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| addressee | (noun) one to whom something is addressed | - |
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| adiposeness | (noun) having the property of containing fat | Synonyms: adiposity, fattiness |
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| advertisement | (noun) a public promotion of some product or service | Synonyms: ad, advert, advertising, advertizement, advertizing |
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| advertiser | (noun) someone whose business is advertising | Synonyms: adman, advertizer |
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| advisee | (noun) someone who receives advice | - |
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| advisement | (noun) careful consideration | Synonyms: deliberation, weighing |
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| adviser | (noun) an expert who gives advice | Synonyms: advisor, consultant |
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| aftersensation | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: afterimage |
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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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| aldohexose | (noun) a monosaccharide sugar having six carbon atoms and an aldehyde group | - |
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| aldose | (noun) a monosaccharide sugar that contains the aldehyde group or is hemiacetal | - |
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| aldotetrose | (noun) A four-carbon aldose; for example, threose, erythrose. | - |
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| aldotriose | (noun) Any aldose having three carbon atoms; in reality, just glyceraldehyde. | - |
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| alehouse | (noun) a tavern where ale is sold | - |
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| alkaliser | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkalizer, antacid, antiacid, gastric antacid |
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| allegoriser | (noun) someone who communicates in allegories | Synonyms: allegorizer |
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| alphabetiser | (noun) a literate person who can arrange items in alphabetical order | Synonyms: alphabetizer |
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| aminopherase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminotransferase, transaminase |
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| aminotransferase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminopherase, transaminase |
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| amusement | (noun) an activity that is diverting and that holds the attention | Synonyms: entertainment |
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| (noun) a feeling of delight at being entertained | - |
| amylase | (noun) any of a group of proteins found in saliva and pancreatic juice and parts of plants; help convert starch to sugar | - |
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| analyser | (noun) an instrument that performs analyses | Synonyms: analyzer |
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| anaphase | (noun) the stage of meiosis or mitosis when chromosomes move toward opposite ends of the nuclear spindle | - |
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| anise | (noun) liquorice-flavored seeds, used medicinally and in cooking and liquors | Synonyms: anise seed, aniseed |
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| (noun) native to Egypt but cultivated widely for its aromatic seeds and the oil from them used medicinally and as a flavoring in cookery | Synonyms: anise plant, Pimpinella anisum |
| aniseed | (noun) liquorice-flavored seeds, used medicinally and in cooking and liquors | Synonyms: anise, anise seed |
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| aniseikonia | (noun) visual defect in which the shape and size of an ocular image differ in the two eyes | - |
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| anisette | (noun) liquorice-flavored usually colorless sweet liqueur made from aniseed | Synonyms: anisette de Bordeaux |
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| anticholinesterase | (noun) a medicine that inhibits cholinesterase by combining with it and so has a cholinergic effect | - |
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| antisemitism | (noun) the intense dislike for and prejudice against Jewish people | Synonyms: anti-Semitism |
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| antisepsis | (noun) the process of inhibiting the growth and multiplication of microorganisms | Synonyms: asepsis |
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| (noun) (of non-living objects) the state of being free of pathogenic organisms | Synonyms: asepsis, sterileness, sterility |
| antiseptic | (noun) a substance that destroys micro-organisms that carry disease without harming body tissues | - |
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| antiserum | (noun) blood serum containing antibodies against specific antigens; provides immunity to a disease | - |
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| apocalypse | (noun) a cosmic cataclysm in which God destroys the ruling powers of evil | - |
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| aposelene | (noun) apoapsis in orbit around the moon | Synonyms: apolune |
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| appeasement | (noun) the act of appeasing (as by acceding to the demands of) | Synonyms: calming |
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| appeaser | (noun) someone who tries to bring peace by acceding to demands | - |
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| appetiser | (noun) food or drink to stimulate the appetite (usually served before a meal or as the first course) | Synonyms: appetizer, starter |
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| applause | (noun) a demonstration of approval by clapping the hands together | Synonyms: clapping, hand clapping |
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| appraiser | (noun) one who estimates officially the worth or value or quality of things | Synonyms: valuator |
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| (noun) one who determines authenticity (as of works of art) or who guarantees validity | Synonyms: authenticator |
| apse | (noun) a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar | Synonyms: apsis |
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| arccosecant | (noun) the angle that has a cosecant equal to a given number | Synonyms: arc cosecant, inverse cosecant |
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| archdiocese | (noun) the diocese of an archbishop | - |
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| arcsec | (noun) the inverse function of the secant; the angle that has a secant equal to a given number | Synonyms: arc secant, arcsecant, inverse secant |
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| arcsecant | (noun) the inverse function of the secant; the angle that has a secant equal to a given number | Synonyms: arc secant, arcsec, inverse secant |
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| arcsecond | (noun) a 60th part of a minute of arc | Synonyms: second |
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| arouser | (noun) someone who rouses others from sleep | Synonyms: rouser, waker |
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| arse | (noun) vulgar slang for anus | Synonyms: arsehole, asshole, bunghole |
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| (noun) the fleshy part of the human body that you sit on | Synonyms: ass, backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
| arsehole | (noun) vulgar slang for anus | Synonyms: arse, asshole, bunghole |
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| arsenal | (noun) a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms | Synonyms: armory, armoury |
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| (noun) a place where arms are manufactured | Synonyms: armory, armoury |
| (noun) all the weapons and equipment that a country has | Synonyms: armory, armoury |
| arsenate | (noun) a salt or ester of arsenic acid | - |
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| arsenic | (noun) a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and in various alloys; found in arsenopyrite and orpiment and realgar | Synonyms: As, atomic number 33 |
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| (noun) a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer | Synonyms: arsenic trioxide, arsenous anhydride, arsenous oxide, ratsbane, white arsenic |
| arsenical | (noun) a pesticide or drug containing arsenic | - |
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| arsenide | (noun) a compound of arsenic with a more positive element | - |
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| arsenopyrite | (noun) a silver-white or grey ore of arsenic | Synonyms: mispickel |
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| asepsis | (noun) the process of inhibiting the growth and multiplication of microorganisms | Synonyms: antisepsis |
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| (noun) (of non-living objects) the state of being free of pathogenic organisms | Synonyms: antisepsis, sterileness, sterility |
| asexuality | (noun) having no evident sex or sex organs | Synonyms: sexlessness |
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| asparaginase | (noun) antineoplastic drug (trade name Elspar) sometimes used to treat lymphoblastic leukemia | Synonyms: Elspar |
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| assegai | (noun) the slender spear of the Bantu-speaking people of Africa | Synonyms: assagai |
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| assemblage | (noun) the social act of assembling | Synonyms: assembly, gathering |
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| (noun) a system of components assembled together for a particular purpose | Synonyms: hookup |
| (noun) a group of persons together in one place | Synonyms: gathering |
| (noun) several things grouped together or considered as a whole | Synonyms: accumulation, aggregation, collection |
| assembler | (noun) a program to convert assembly language into machine language | Synonyms: assembly program |
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| assembling | (noun) the act of gathering something together | Synonyms: aggregation, collecting, collection |
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| assembly | (noun) the social act of assembling | Synonyms: assemblage, gathering |
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| (noun) the act of constructing something (as a piece of machinery) | Synonyms: fabrication |
| (noun) a group of machine parts that fit together to form a self-contained unit | - |
| (noun) a public facility to meet for open discussion | Synonyms: forum, meeting place |
| (noun) a unit consisting of components that have been fitted together | - |
| (noun) a group of persons who are gathered together for a common purpose | - |
| assemblyman | (noun) someone who is a member of a legislative assembly | - |
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| assemblywoman | (noun) a woman assemblyman | - |
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| assent | (noun) agreement with a statement or proposal to do something | Synonyms: acquiescence |
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| assenter | (noun) a person who assents | - |
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| assenting | (noun) agreeing with or consenting to (often unwillingly) | Synonyms: accession |
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| asserter | (noun) someone who claims to speak the truth | Synonyms: affirmer, asseverator, avower, declarer |
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| assertion | (noun) a declaration that is made emphatically (as if no supporting evidence were necessary) | Synonyms: asseveration, averment |
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| (noun) the act of affirming or asserting or stating something | Synonyms: affirmation, statement |
| assertiveness | (noun) aggressive self-assurance; given to making bold assertions | Synonyms: self-assertiveness |
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| assessee | (noun) a person (or property) that is assessed | - |
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| assessment | (noun) the act of judging or assessing a person or situation or event | Synonyms: judgement, judgment |
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| (noun) the market value set on assets | - |
| (noun) the classification of someone or something with respect to its worth | Synonyms: appraisal |
| (noun) an amount determined as payable | - |
| assessor | (noun) an official who evaluates property for the purpose of taxing it | Synonyms: tax assessor |
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| asset | (noun) a useful or valuable quality | Synonyms: plus |
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| assets | (noun) anything of material value or usefulness that is owned by a person or company | - |
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| asseveration | (noun) a declaration that is made emphatically (as if no supporting evidence were necessary) | Synonyms: assertion, averment |
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| asseverator | (noun) someone who claims to speak the truth | Synonyms: affirmer, asserter, avower, declarer |
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| atomiser | (noun) a dispenser that turns a liquid (such as perfume) into a fine mist | Synonyms: atomizer, nebuliser, nebulizer, spray, sprayer |
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| attosecond | (noun) one quintillionth (10^-18) of a second; one thousandth of a femtosecond | - |
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| audiocassette | (noun) a cassette for audiotape | - |
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| authoriser | (noun) an authority who authorizes (people or actions) | Synonyms: authorizer |
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| autosexing | (noun) (especially of domestic fowl) breeding to reveal differential sex characteristics at hatching | - |
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| axseed | (noun) European herb resembling vetch; naturalized in the eastern United States; having umbels of pink-and-white flowers and sharp-angled pods | Synonyms: Coronilla varia, crown vetch |
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| backseat | (noun) a seat at the back of a vehicle (especially the seat at the back of an automobile) | - |
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| (noun) a secondary or inferior position or status | - |
| bagasse | (noun) the dry dusty pulp that remains after juice is extracted from sugar cane or similar plants | - |
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| bakehouse | (noun) a workplace where baked goods (breads and cakes and pastries) are produced or sold | Synonyms: bakery, bakeshop |
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| barrelhouse | (noun) a cheap drinking and dancing establishment | Synonyms: honky-tonk |
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