| abdominocentesis | (noun) centesis of the belly to remove fluid for diagnosis | Synonyms: paracentesis |
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| abducens | (noun) a small motor nerve supplying the lateral rectus muscle of the eye | Synonyms: abducens nerve, abducent, abducent nerve, nervus abducens, sixth cranial nerve |
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| abducent | (noun) a small motor nerve supplying the lateral rectus muscle of the eye | Synonyms: abducens, abducens nerve, abducent nerve, nervus abducens, sixth cranial nerve |
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| abecedarian | (noun) a novice learning the rudiments of some subject | - |
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| abecedarius | (noun) a poem having lines beginning with letters of the alphabet in regular order | - |
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| aberrance | (noun) a state or condition markedly different from the norm | Synonyms: aberrancy, aberration, deviance |
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| abeyance | (noun) temporary cessation or suspension | Synonyms: suspension |
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| abhorrence | (noun) hate coupled with disgust | Synonyms: abomination, detestation, execration, loathing, odium |
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| abidance | (noun) the act of abiding (enduring without yielding) | - |
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| (noun) the act of dwelling in a place | Synonyms: residence, residency |
| (noun) acting according to certain accepted standards | Synonyms: compliance, conformation, conformity |
| abience | (noun) (psychology) an urge to withdraw or avoid a situation or an object | - |
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| abscess | (noun) symptom consisting of a localized collection of pus surrounded by inflamed tissue | - |
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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 | - |
| absorbance | (noun) (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation | Synonyms: optical density, photographic density, transmission density |
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| absorptance | (noun) a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber | Synonyms: absorption coefficient, coefficient of absorption |
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| abstinence | (noun) act or practice of refraining from indulging an appetite | - |
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| (noun) the trait of abstaining (especially from alcohol) | Synonyms: abstention |
| abundance | (noun) the property of a more than adequate quantity or supply | Synonyms: copiousness, teemingness |
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| (noun) (chemistry) the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust; expressed as a percentage or in parts per million | - |
| (noun) (physics) the ratio of the number of atoms of a specific isotope of an element to the total number of isotopes present | - |
| acanthocephalan | (noun) any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines | Synonyms: spiny-headed worm |
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| accelerando | (noun) a gradually increasing tempo of music | - |
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| acceleration | (noun) the act of accelerating; increasing the speed | Synonyms: quickening, speedup |
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| (noun) an increase in rate of change | - |
| (noun) (physics) a rate of increase of velocity | - |
| accelerator | (noun) a valve that regulates the supply of fuel to the engine | Synonyms: throttle, throttle valve |
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| (noun) a scientific instrument that increases the kinetic energy of charged particles | Synonyms: atom smasher, particle accelerator |
| (noun) a pedal that controls the throttle valve | Synonyms: accelerator pedal, gas, gas pedal, gun, throttle |
| (noun) (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected | Synonyms: catalyst |
| accelerometer | (noun) an instrument for measuring the acceleration of aircraft or rockets | - |
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| accent | (noun) the relative prominence of a syllable or musical note (especially with regard to stress or pitch) | Synonyms: emphasis, stress |
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| (noun) distinctive manner of oral expression | Synonyms: speech pattern |
| (noun) a diacritical mark used to indicate stress or placed above a vowel to indicate a special pronunciation | Synonyms: accent mark |
| (noun) the usage or vocabulary that is characteristic of a specific group of people | Synonyms: dialect, idiom |
| (noun) special importance or significance | Synonyms: emphasis |
| accenting | (noun) the act of giving special importance or significance to something | Synonyms: accentuation, emphasizing |
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| accentor | (noun) small sparrow-like songbird of mountainous regions of Eurasia | - |
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| accentuation | (noun) the act of giving special importance or significance to something | Synonyms: accenting, emphasizing |
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| (noun) the use or application of an accent; the relative prominence of syllables in a phrase or utterance | - |
| acceptability | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptableness |
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| acceptableness | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptability |
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| acceptance | (noun) the act of accepting with approval; favorable reception | Synonyms: acceptation, adoption, espousal |
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| (noun) the act of taking something that is offered | - |
| (noun) a disposition to tolerate or accept people or situations | Synonyms: sufferance, toleration |
| (noun) the mental attitude that something is believable and should be accepted as true | Synonyms: credence |
| (noun) (contract law) words signifying consent to the terms of an offer (thereby creating a contract) | - |
| (noun) a time draft drawn on and accepted by a bank | Synonyms: banker's acceptance |
| (noun) the state of being acceptable and accepted | - |
| acceptation | (noun) the act of accepting with approval; favorable reception | Synonyms: acceptance, adoption, espousal |
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| (noun) the accepted meaning of a word | Synonyms: word meaning, word sense |
| (noun) acceptance as true or valid | - |
| acceptor | (noun) the person (or institution) who accepts a check or draft and becomes responsible for paying the party named in the draft when it matures | - |
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| (noun) (chemistry) in the formation of a coordinate bond it is the compound to which electrons are donated | - |
| access | (noun) the act of approaching or entering | - |
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| (noun) a way of entering or leaving | Synonyms: approach |
| (noun) (computer science) the operation of reading or writing stored information | Synonyms: memory access |
| (noun) the right to enter | Synonyms: accession, admission, admittance, entree |
| (noun) the right to obtain or make use of or take advantage of something (as services or membership) | - |
| (noun) a code (a series of characters or digits) that must be entered in some way (typed or dialed or spoken) to get the use of something (a telephone line or a computer or a local area network etc.) | Synonyms: access code |
| accessary | (noun) someone who helps another person commit a crime | Synonyms: accessory |
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| accessibility | (noun) the quality of being at hand when needed | Synonyms: availability, availableness, handiness |
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| (noun) the attribute of being easy to meet or deal with | Synonyms: approachability |
| accession | (noun) the act of attaining or gaining access to a new office or right or position (especially the throne) | Synonyms: rise to power |
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| (noun) the right to enter | Synonyms: access, admission, admittance, entree |
| (noun) agreeing with or consenting to (often unwillingly) | Synonyms: assenting |
| (noun) something added to what you already have | Synonyms: addition |
| (noun) (civil law) the right to all of that which your property produces whether by growth or improvement | - |
| (noun) a process of increasing by addition (as to a collection or group) | - |
| accessory | (noun) a supplementary component that improves capability | Synonyms: add-on, appurtenance, supplement |
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| (noun) clothing that is worn or carried, but not part of your main clothing | Synonyms: accouterment, accoutrement |
| (noun) someone who helps another person commit a crime | Synonyms: accessary |
| accidence | (noun) the part of grammar that deals with the inflections of words | Synonyms: inflectional morphology |
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| accomplice | (noun) a person who joins with another in carrying out some plan (especially an unethical or illegal plan) | Synonyms: confederate |
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| accordance | (noun) the act of granting rights | Synonyms: accordance of rights |
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| (noun) concurrence of opinion | Synonyms: accord, conformity |
| ace | (noun) a serve that the receiver is unable to reach | - |
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| (noun) one of four playing cards in a deck having a single pip on its face | - |
| (noun) someone who is dazzlingly skilled in any field | Synonyms: adept, champion, genius, hotshot, maven, mavin, sensation, star, superstar, virtuoso, whiz, whizz, wiz, wizard |
| (noun) the smallest whole number or a numeral representing this number | Synonyms: 1, I, one, single, unity |
| acebutolol | (noun) an oral beta blocker (trade name Sectral) used in treating hypertension | Synonyms: Sectral |
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| acedia | (noun) apathy and inactivity in the practice of virtue (personified as one of the deadly sins) | Synonyms: laziness, sloth |
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| acephalia | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalism, acephaly |
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| acephalism | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephaly |
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| acephaly | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephalism |
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| acerbity | (noun) a rough and bitter manner | Synonyms: acrimony, bitterness, jaundice, tartness, thorniness |
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| (noun) a sharp sour taste | Synonyms: tartness |
| (noun) a sharp bitterness | - |
| acerola | (noun) acid red or yellow cherry-like fruit of a tropical American shrub very rich in vitamin C | Synonyms: barbados cherry, surinam cherry, West Indian cherry |
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| (noun) tropical American shrub bearing edible acid red fruit resembling cherries | Synonyms: barbados cherry, Malpighia glabra, Surinam cherry, West Indian cherry |
| acervulus | (noun) small asexual fruiting body resembling a cushion or blister consisting of a mat of hyphae that is produced on a host by some fungi | - |
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| acetabulum | (noun) the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint | Synonyms: cotyloid cavity |
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| acetal | (noun) any organic compound formed by adding alcohol molecules to aldehyde molecules | - |
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| acetaldehyde | (noun) a colorless volatile water-soluble liquid aldehyde used chiefly in the manufacture of acetic acid and perfumes and drugs | Synonyms: ethanal |
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| acetaldol | (noun) unsaturated aldol | - |
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| acetamide | (noun) a colorless solid amide of acetic acid used as a solvent and in the synthesis of organic compounds | Synonyms: ethanamide |
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| acetaminophen | (noun) an analgesic for mild pain but not for inflammation; also used as an antipyretic; (Datril, Tylenol, Panadol, Phenaphen, Tempra, and Anacin III are trademarks of brands of acetaminophen tablets) | Synonyms: Anacin III, Datril, Panadol, Phenaphen, Tempra, Tylenol |
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| acetanilid | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilide, phenylacetamide |
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| acetanilide | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilid, phenylacetamide |
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| acetate | (noun) a fabric made from fibers of cellulose acetate | Synonyms: acetate rayon |
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| (noun) a salt or ester of acetic acid | Synonyms: ethanoate |
| acetin | (noun) any of three liquid acetates that are formed when acetic acid and glycerin are heated together | - |
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| acetone | (noun) the simplest ketone; a highly flammable liquid widely used as an organic solvent and as material for making plastics | Synonyms: dimethyl ketone, propanone |
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| acetonemia | (noun) an abnormal increase of ketone bodies in the blood as in diabetes mellitus | Synonyms: ketonemia, ketosis |
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| acetonuria | (noun) excessive amounts of ketone bodies in the urine as in diabetes mellitus or starvation | Synonyms: ketoaciduria, ketonuria |
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| acetophenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetphenetidin, phenacetin |
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| acetphenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetophenetidin, phenacetin |
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| acetum | (noun) sour-tasting liquid produced usually by oxidation of the alcohol in wine or cider and used as a condiment or food preservative | Synonyms: vinegar |
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| (noun) a dilute solution of acetic acid that is used as a solvent (e.g. for a drug) | - |
| acetyl | (noun) the organic group of acetic acid (CH3CO-) | Synonyms: acetyl group, acetyl radical, ethanoyl group, ethanoyl radical |
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| 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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| 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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| acquiescence | (noun) agreement with a statement or proposal to do something | Synonyms: assent |
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| (noun) acceptance without protest | - |
| acquittance | (noun) a legal document evidencing the discharge of a debt or obligation | Synonyms: release |
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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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| actinomycete | (noun) any bacteria (some of which are pathogenic for humans and animals) belonging to the order Actinomycetales | - |
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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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| 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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| 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 |
| 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 | (noun) a juvenile between the onset of puberty and maturity | Synonyms: stripling, teen, teenager |
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| advance | (noun) the act of moving forward (as toward a goal) | Synonyms: advancement, forward motion, onward motion, procession, progress, progression |
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| (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 |
| 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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| 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 |
| 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 |
| 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 |
| 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 |