| 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 | (noun) a class of synthetic detergents in which the molecules do not ionize in aqueous solutions | Synonyms: anionic detergent, non-ionic detergent |
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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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| 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 |
| 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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| 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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| 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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| 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 |
| 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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| antielectron | (noun) an elementary particle with positive charge; interaction of a positron and an electron results in annihilation | Synonyms: positron |
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| antilepton | (noun) the antiparticle of a lepton | - |
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| antimeson | (noun) the antiparticle of a meson | - |
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| antimony | (noun) a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnite | Synonyms: atomic number 51, Sb |
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| antimuon | (noun) the antiparticle of a muon; decays to positron and neutrino and antineutrino | Synonyms: positive muon |
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| antineutron | (noun) the antiparticle of a neutron | - |
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| antiphon | (noun) a verse or song to be chanted or sung in response | Synonyms: antiphony |
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| antiphonal | (noun) bound collection of antiphons | Synonyms: antiphonary |
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| antiphonary | (noun) bound collection of antiphons | Synonyms: antiphonal |
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| antiphony | (noun) alternate (responsive) singing by a choir in two parts | - |
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| (noun) a verse or song to be chanted or sung in response | Synonyms: antiphon |
| antiproton | (noun) an unstable negatively charged proton; the antiparticle of a proton | - |
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| antiredeposition | (noun) the process of preventing redeposition | - |
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| antitauon | (noun) an antilepton of very great mass | Synonyms: tau-plus particle |
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| antlion | (noun) winged insect resembling a dragonfly; the larvae (doodlebugs) dig conical pits where they wait to catch e.g. ants | Synonyms: ant lion, antlion fly |
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| (noun) the larva of any of several insects | Synonyms: ant lion, doodlebug |
| antonym | (noun) a word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other | Synonyms: opposite, opposite word |
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| antonymy | (noun) the semantic relation that holds between two words that can (in a given context) express opposite meanings | - |
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| aphelion | (noun) apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun | - |
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| aphonia | (noun) a disorder of the vocal organs that results in the loss of voice | Synonyms: voicelessness |
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| apicalization | (noun) (phonetics) An articulatory feature of phones, usually consonants, produced by obstructing the air passage with the tip of the tongue. | - |
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| aponeurosis | (noun) any of the deeper and thicker fascia that attach muscles to bones; resemble flattened tendons | - |
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| apparition | (noun) an act of appearing or becoming visible unexpectedly | - |
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| (noun) something existing in perception only | Synonyms: fantasm, phantasm, phantasma, phantom, shadow |
| (noun) the appearance of a ghostlike figure | - |
| (noun) a ghostly appearing figure | Synonyms: fantasm, phantasm, phantasma, phantom, specter, spectre |
| appellation | (noun) identifying word or words by which someone or something is called and classified or distinguished from others | Synonyms: appellative, denomination, designation |
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| (noun) a geographical indication used to identify where the grapes for a wine are grown | - |
| apperception | (noun) the process whereby perceived qualities of an object are related to past experience | - |
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| application | (noun) the action of putting something into operation | - |
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| (noun) a diligent effort | Synonyms: diligence |
| (noun) the act of bringing something to bear; using it for a particular purpose | Synonyms: practical application |
| (noun) the work of applying something | Synonyms: coating, covering |
| (noun) liquid preparation having a soothing or antiseptic or medicinal action when applied to the skin | Synonyms: lotion |
| (noun) a verbal or written request for assistance or employment or admission to a school | - |
| (noun) a program that gives a computer instructions that provide the user with tools to accomplish a task | Synonyms: application program, applications programme |
| apportioning | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allocation, allotment, apportionment, assignation, parceling, parcelling |
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| apportionment | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allocation, allotment, apportioning, assignation, parceling, parcelling |
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| apposition | (noun) the act of positioning close together (or side by side) | Synonyms: collocation, juxtaposition |
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| (noun) (biology) growth in the thickness of a cell wall by the deposit of successive layers of material | - |
| (noun) a grammatical relation between a word and a noun phrase that follows | - |
| appreciation | (noun) a favorable judgment | Synonyms: admiration |
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| (noun) an increase in price or value | - |
| (noun) understanding of the nature or meaning or quality or magnitude of something | Synonyms: grasp, hold |
| (noun) delicate discrimination (especially of esthetic values) | Synonyms: discernment, perceptiveness, taste |
| (noun) an expression of gratitude | - |
| apprehension | (noun) the act of apprehending (especially apprehending a criminal) | Synonyms: arrest, catch, collar, pinch, taking into custody |
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| (noun) the cognitive condition of someone who understands | Synonyms: discernment, savvy, understanding |
| (noun) painful expectation | Synonyms: misgiving |
| (noun) fearful expectation or anticipation | Synonyms: apprehensiveness, dread |
| approbation | (noun) official recognition or approval | - |
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| (noun) official approval | - |
| appropriation | (noun) a deliberate act of acquisition of something, often without the permission of the owner | - |
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| (noun) incorporation by joining or uniting | Synonyms: annexation |
| (noun) money set aside (as by a legislature) for a specific purpose | - |
| approximation | (noun) the act of bringing near or bringing together especially the cut edges of tissue | Synonyms: bringing close together |
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| (noun) the quality of coming near to identity (especially close in quantity) | - |
| (noun) an approximate calculation of quantity or degree or worth | Synonyms: estimate, estimation, idea |
| (noun) an imprecise or incomplete account | - |
| apron | (noun) a garment of cloth or leather or plastic that is tied about the waist and worn to protect your clothing | - |
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| (noun) a paved surface where aircraft stand while not being used | - |
| (noun) the part of a modern theater stage between the curtain and the orchestra (i.e., in front of the curtain) | Synonyms: forestage, proscenium |
| (noun) (golf) the part of the fairway leading onto the green | - |
| aragonite | (noun) a mineral form of crystalline calcium carbonate; dimorphic with calcite | - |
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| arbitration | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitrament, arbitrement |
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| (noun) (law) the hearing and determination of a dispute by an impartial referee agreed to by both parties (often used to settle disputes between labor and management) | - |
| archdeacon | (noun) (Anglican Church) an ecclesiastical dignitary usually ranking just below a bishop | - |
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| archdeaconry | (noun) the territorial jurisdiction of an archdeacon | - |
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| archegonium | (noun) a female sex organ occurring in mosses, ferns, and most gymnosperms | - |
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| archenteron | (noun) central cavity of the gastrula; becomes the intestinal or digestive cavity | - |
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| archidiaconate | (noun) office or position of an archdeacon | - |
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| architectonics | (noun) the science of architecture | Synonyms: tectonics |
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| arcsecond | (noun) a 60th part of a minute of arc | Synonyms: second |
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| argemone | (noun) any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods; chiefly of tropical America | Synonyms: devil's fig, prickly poppy, white thistle |
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| argon | (noun) a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere | Synonyms: Ar, atomic number 18 |
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| argonaut | (noun) someone engaged in a dangerous but potentially rewarding adventure | - |
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| argonon | (noun) any of the chemically inert gaseous elements of the helium group in the periodic table | Synonyms: inert gas, noble gas |
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| argumentation | (noun) a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning | Synonyms: argument, line, line of reasoning, logical argument |
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| (noun) a discussion in which reasons are advanced for and against some proposition or proposal | Synonyms: argument, debate |
| arrogation | (noun) seizure by the government | Synonyms: confiscation |
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| arson | (noun) malicious burning to destroy property | Synonyms: fire-raising, incendiarism |
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| arsonist | (noun) a criminal who illegally sets fire to property | Synonyms: firebug, incendiary |
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| articulation | (noun) the act of joining things in such a way that motion is possible | - |
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| (noun) (anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion) | Synonyms: articulatio, joint |
| (noun) the aspect of pronunciation that involves bringing articulatory organs together so as to shape the sounds of speech | - |
| (noun) expressing in coherent verbal form | Synonyms: voice |
| (noun) the shape or manner in which things come together and a connection is made | Synonyms: join, joint, junction, juncture |
| ascension | (noun) the act of changing location in an upward direction | Synonyms: ascending, ascent, rise |
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| (noun) a movement upward; rise above the ground | Synonyms: ascent, rise, rising |
| (noun) (astronomy) the rising of a star above the horizon | - |
| ascription | (noun) assigning to a cause or source | Synonyms: attribution |
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| (noun) assigning some quality or character to a person or thing | Synonyms: attribution |
| aspersion | (noun) an abusive attack on a person's character or good name | Synonyms: calumny, defamation, denigration, slander |
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| (noun) the act of sprinkling water in baptism (rare) | Synonyms: sprinkling |
| (noun) a disparaging remark | Synonyms: slur |
| asphyxiation | (noun) killing by depriving of oxygen | Synonyms: suffocation |
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| (noun) the condition of being deprived of oxygen (as by having breathing stopped) | Synonyms: suffocation |
| aspiration | (noun) the act of inhaling; the drawing in of air (or other gases) as in breathing | Synonyms: breathing in, inhalation, inspiration, intake |
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| (noun) a will to succeed | - |
| (noun) a manner of articulation involving an audible release of breath | - |
| (noun) a cherished desire | Synonyms: ambition, dream |
| assassination | (noun) murder of a public figure by surprise attack | - |
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| (noun) an attack intended to ruin someone's reputation | Synonyms: blackwash, character assassination |
| 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 |
| asseveration | (noun) a declaration that is made emphatically (as if no supporting evidence were necessary) | Synonyms: assertion, averment |
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| assibilation | (noun) pronunciation with a sibilant (hissing or whistling) sound | Synonyms: sibilation |
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| (noun) the development of a consonant phoneme into a sibilant | - |
| assignation | (noun) a secret rendezvous (especially between lovers) | Synonyms: tryst |
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| (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allocation, allotment, apportioning, apportionment, parceling, parcelling |
| assimilation | (noun) in the theories of Jean Piaget: the application of a general schema to a particular instance | - |
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| (noun) the process of assimilating new ideas into an existing cognitive structure | Synonyms: acculturation |
| (noun) a linguistic process by which a sound becomes similar to an adjacent sound | - |
| (noun) the process of absorbing nutrients into the body after digestion | Synonyms: absorption |
| (noun) the social process of absorbing one cultural group into harmony with another | Synonyms: absorption |
| (noun) the state of being assimilated; people of different backgrounds come to see themselves as part of a larger national family | - |
| association | (noun) the act of consorting with or joining with others | - |
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| (noun) the process of bringing ideas or events together in memory or imagination | Synonyms: connection, connexion |
| (noun) a formal organization of people or groups of people | - |
| (noun) (ecology) a group of organisms (plants and animals) that live together in a certain geographical region and constitute a community with a few dominant species | - |
| (noun) (chemistry) any process of combination (especially in solution) that depends on relatively weak chemical bonding | - |
| (noun) a relation resulting from interaction or dependence | - |
| (noun) a social or business relationship | Synonyms: affiliation, tie-up, tie |
| (noun) the state of being connected together as in memory or imagination | - |
| associationism | (noun) (psychology) a theory that association is the basic principle of mental activity | Synonyms: association theory |
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| assonance | (noun) the repetition of similar vowels in the stressed syllables of successive words | Synonyms: vowel rhyme |
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| assumption | (noun) the act of taking possession of or power over something | Synonyms: laying claim |
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| (noun) the act of assuming or taking for granted | - |
| (noun) audacious (even arrogant) behavior that you have no right to | Synonyms: effrontery, presumption, presumptuousness |
| (noun) a hypothesis that is taken for granted | Synonyms: supposal, supposition |
| (noun) a statement that is assumed to be true and from which a conclusion can be drawn | Synonyms: premise, premiss |
| asterion | (noun) the craniometric point at the junction of the lamboid suture and the occipitomastoid suture and the parietomastoid suture | - |
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| astonishment | (noun) the feeling that accompanies something extremely surprising | Synonyms: amazement |
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| astronaut | (noun) a person trained to travel in a spacecraft | Synonyms: cosmonaut, spaceman |
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| astronautics | (noun) the theory and practice of navigation through air or space | Synonyms: aeronautics |
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