| antinomian | (noun) a follower of the doctrine of antinomianism | - |
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| antinomianism | (noun) the theological doctrine that by faith and God's grace a Christian is freed from all laws (including the moral standards of the culture) | - |
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| antinomy | (noun) a contradiction between two statements that seem equally reasonable | - |
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| antisemitism | (noun) the intense dislike for and prejudice against Jewish people | Synonyms: anti-Semitism |
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| antiserum | (noun) blood serum containing antibodies against specific antigens; provides immunity to a disease | - |
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| antispasmodic | (noun) a drug used to relieve or prevent spasms (especially of the smooth muscles) | Synonyms: antispasmodic agent, spasmolytic |
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| 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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| antrum | (noun) a natural cavity or hollow in a bone | - |
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| apartment | (noun) a suite of rooms usually on one floor of an apartment house | Synonyms: flat |
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| aphorism | (noun) a short pithy instructive saying | Synonyms: apophthegm, apothegm |
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| apishamore | (noun) a saddle blanket made of buffalo hide | - |
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| aplomb | (noun) great coolness and composure under strain | Synonyms: assuredness, cool, poise, sang-froid |
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| apodeme | (noun) ridge-like ingrowth of the exoskeleton of an arthropod that supports internal organs and provides attachment points for muscles | - |
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| apoenzyme | (noun) a protein that combines with a coenzyme to form an active enzyme | - |
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| apogamy | (noun) (botany) development of an embryo without fertilization; especially the development in some ferns of a sporophyte from the gametophyte without fertilization | - |
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| apolemia | (noun) large siphonophore of up to 50 ft long | - |
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| apoliticism | (noun) Apathy and/or antipathy towards all political affiliations. | - |
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| apomict | (noun) a plant that reproduces or is reproduced by apomixis | - |
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| apomixis | (noun) any of several kinds of reproduction without fertilization | - |
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| apomorphine | (noun) a morphine derivative that is not as strong as morphine; used as an emetic and in small doses as a sedative | - |
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| apophatism | (noun) the religious belief that God cannot be known but is completely `other' and must be described in negative terms (in terms of what God is not) | - |
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| apophthegm | (noun) a short pithy instructive saying | Synonyms: aphorism, apothegm |
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| apothecium | (noun) a cuplike ascocarp in many lichens and ascomycetous fungi | - |
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| apothegm | (noun) a short pithy instructive saying | Synonyms: aphorism, apophthegm |
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| appeasement | (noun) the act of appeasing (as by acceding to the demands of) | Synonyms: calming |
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| appendectomy | (noun) surgical removal of the vermiform appendix | Synonyms: appendicectomy |
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| appendicectomy | (noun) surgical removal of the vermiform appendix | Synonyms: appendectomy |
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| applemint | (noun) mint with apple-scented stems of southern and western Europe; naturalized in United States | Synonyms: apple mint, Mentha rotundifolia, Mentha suaveolens |
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| appointment | (noun) the act of putting a person into a non-elective position | Synonyms: assignment, designation, naming |
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| (noun) the job to which you are (or hope to be) appointed | - |
| (noun) (law) the act of disposing of property by virtue of the power of appointment | - |
| (noun) (usually in the plural) furnishings and equipment (especially for a ship or hotel) | Synonyms: fitting |
| (noun) a meeting arranged in advance | Synonyms: date, engagement |
| (noun) a person who is appointed to a job or position | Synonyms: appointee |
| 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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| 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 | - |
| apriorism | (noun) belief in a priori principles or reasoning; specifically : the doctrine that knowledge rests upon principles that are self-evident to reason or are presupposed by experience in general. | - |
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| aquamarine | (noun) a shade of blue tinged with green | Synonyms: aqua, cobalt blue, greenish blue, peacock blue, turquoise |
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| (noun) a transparent variety of beryl that is blue green in color | - |
| aquarium | (noun) a tank or pool or bowl filled with water for keeping live fish and underwater animals | Synonyms: fish tank, marine museum |
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| arame | (noun) an edible seaweed with a mild flavor | - |
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| arbitrament | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitration, arbitrement |
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| arbitrement | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitrament, arbitration |
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| arboretum | (noun) a facility where trees and shrubs are cultivated for exhibition | Synonyms: botanical garden |
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| arcanum | (noun) information known only to a special group | Synonyms: secret |
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| archaebacterium | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaeobacteria, archeobacteria |
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| archaicism | (noun) the use of an archaic expression | Synonyms: archaism |
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| archaism | (noun) the use of an archaic expression | Synonyms: archaicism |
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| archegonium | (noun) a female sex organ occurring in mosses, ferns, and most gymnosperms | - |
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| archesporium | (noun) primitive cell or group of cells from which a mother cell develops | Synonyms: archespore |
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| archimandrite | (noun) the superior of an abbey of monks | Synonyms: abbot |
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| archipallium | (noun) the olfactory cortex of the cerebrum | Synonyms: paleocortex |
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| arcminute | (noun) a unit of angular distance equal to a 60th of a degree | Synonyms: minute, minute of arc |
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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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| argument | (noun) a variable in a logical or mathematical expression whose value determines the dependent variable; if f(x)=y, x is the independent variable | - |
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| (noun) a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning | Synonyms: argumentation, line, line of reasoning, logical argument |
| (noun) a discussion in which reasons are advanced for and against some proposition or proposal | Synonyms: argumentation, debate |
| (noun) a summary of the subject or plot of a literary work or play or movie | Synonyms: literary argument |
| (noun) a fact or assertion offered as evidence that something is true | Synonyms: statement |
| (noun) a contentious speech act; a dispute where there is strong disagreement | Synonyms: arguing, contention, contestation, controversy, disceptation, disputation, tilt |
| (noun) (computer science) a reference or value that is passed to a function, procedure, subroutine, command, or program | Synonyms: parameter |
| 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 |
| aristocratism | (noun) the principles, practices or characteristics of aristocracy. | - |
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| arithmancy | (noun) divination by means of numbers | - |
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| arithmetic | (noun) the branch of pure mathematics dealing with the theory of numerical calculations | - |
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| arithmetician | (noun) someone who specializes in arithmetic | - |
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| arm | (noun) the part of a garment that is attached at the armhole and that provides a cloth covering for the arm | Synonyms: sleeve |
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| (noun) any instrument or instrumentality used in fighting or hunting | Synonyms: weapon, weapon system |
| (noun) the part of an armchair or sofa that supports the elbow and forearm of a seated person | - |
| (noun) any projection that is thought to resemble a human arm | Synonyms: branch, limb |
| (noun) a human limb; technically the part of the superior limb between the shoulder and the elbow but commonly used to refer to the whole superior limb | - |
| (noun) a division of some larger or more complex organization | Synonyms: branch, subdivision |
| armada | (noun) a large fleet | - |
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| armadillo | (noun) burrowing chiefly nocturnal mammal with body covered with strong horny plates | - |
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| armament | (noun) the act of equipping with weapons in preparation for war | Synonyms: arming, equipping |
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| (noun) weaponry used by military or naval force | - |
| armamentarium | (noun) the collection of equipment and methods used in the practice of medicine | - |
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| armature | (noun) coil in which voltage is induced by motion through a magnetic field | - |
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| armband | (noun) a band worn around the upper arm | - |
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| (noun) worn around arm as identification or to indicate mourning | - |
| armchair | (noun) chair with a support on each side for arms | - |
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| armet | (noun) a medieval helmet with a visor and a neck guard | - |
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| armful | (noun) the quantity that can be contained in the arms | - |
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| armguard | (noun) a protective covering for the wrist or arm that is used in archery and fencing and other sports | Synonyms: bracer |
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| armhole | (noun) a hole through which you put your arm and where a sleeve can be attached | - |
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| armiger | (noun) a squire carrying the armor of a knight | Synonyms: armor-bearer |
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| (noun) a nobleman entitled to bear heraldic arms | - |
| armilla | (noun) (archeology) a bracelet worn around the wrist or arm | - |
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| (noun) a celestial globe consisting of metal hoops; used by early astronomers to determine the positions of stars | Synonyms: armillary sphere |
| arming | (noun) the act of equipping with weapons in preparation for war | Synonyms: armament, equipping |
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| armistice | (noun) a state of peace agreed to between opponents so they can discuss peace terms | Synonyms: cease-fire, truce |
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| armlet | (noun) a band worn around the arm for decoration | Synonyms: arm band |
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| armoire | (noun) a large wardrobe or cabinet; originally used for storing weapons | - |
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| armor | (noun) tough more-or-less rigid protective covering of an animal or plant | Synonyms: armour |
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| (noun) protective covering made of metal and used in combat | Synonyms: armour |
| (noun) a military unit consisting of armored fighting vehicles | Synonyms: armour |
| armorer | (noun) a manufacturer of firearms | Synonyms: armourer |
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| (noun) an enlisted man responsible for the upkeep of small arms and machine guns etc. | Synonyms: armourer, artificer |
| (noun) a worker skilled in making armor or arms | Synonyms: armourer |
| armory | (noun) a place where arms are manufactured | Synonyms: armoury, arsenal |
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| (noun) a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms | Synonyms: armoury, arsenal |
| (noun) all the weapons and equipment that a country has | Synonyms: armoury, arsenal |
| (noun) a collection of resources | Synonyms: armoury, inventory |
| armour | (noun) tough more-or-less rigid protective covering of an animal or plant | Synonyms: armor |
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| (noun) protective covering made of metal and used in combat | Synonyms: armor |
| (noun) a military unit consisting of armored fighting vehicles | Synonyms: armor |
| armourer | (noun) a manufacturer of firearms | Synonyms: armorer |
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| (noun) an enlisted man responsible for the upkeep of small arms and machine guns etc. | Synonyms: armorer, artificer |
| (noun) a worker skilled in making armor or arms | Synonyms: armorer |
| armoury | (noun) a place where arms are manufactured | Synonyms: armory, arsenal |
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| (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, arsenal |
| (noun) all the weapons and equipment that a country has | Synonyms: armory, arsenal |
| (noun) a collection of resources | Synonyms: armory, inventory |
| armpit | (noun) the hollow under the arm where it is joined to the shoulder | Synonyms: axilla, axillary cavity, axillary fossa |
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| armrest | (noun) a support for the arm | - |
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| arms | (noun) weapons considered collectively | Synonyms: implements of war, munition, weaponry, weapons system |
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| (noun) the official symbols of a family, state, etc. | Synonyms: blazon, blazonry, coat of arms |
| army | (noun) a permanent organization of the military land forces of a nation or state | Synonyms: ground forces, regular army |
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| (noun) a large number of people united for some specific purpose | - |
| armyworm | (noun) moth whose destructive larvae travel in multitudes | Synonyms: Pseudaletia unipuncta |
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| (noun) noctuid moth larvae that travel in multitudes destroying especially grass and grain | Synonyms: army worm, Pseudaletia unipuncta |
| (noun) larva of fungus gnat that feed on cereals and other grains; they march in large companies in regular order when the food is exhausted | - |
| aroma | (noun) any property detected by the olfactory system | Synonyms: odor, odour, olfactory property, scent, smell |
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| (noun) a distinctive odor that is pleasant | Synonyms: fragrance, perfume, scent |
| aromatherapy | (noun) the therapeutic use of aromatic plant extracts and essential oils in baths or massage | - |
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| aromaticity | (noun) The property of having an aroma. | - |
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| arraignment | (noun) a legal document calling someone to court to answer an indictment | - |
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| arrangement | (noun) the act of arranging and adapting a piece of music | Synonyms: arranging, transcription |
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| (noun) the spatial property of the way in which something is placed | Synonyms: placement |
| (noun) an organized structure for arranging or classifying | Synonyms: organisation, organization, system |
| (noun) the thing arranged or agreed to | Synonyms: agreement |
| (noun) a piece of music that has been adapted for performance by a particular set of voices or instruments | Synonyms: musical arrangement |
| (noun) an orderly grouping (of things or persons) considered as a unit; the result of arranging | - |
| arrhythmia | (noun) an abnormal rate of muscle contractions in the heart | Synonyms: cardiac arrhythmia |
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| arrowsmith | (noun) a maker of arrows | - |
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| arrowworm | (noun) any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth | Synonyms: chaetognath |
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| artemisia | (noun) any of various composite shrubs or herbs of the genus Artemisia having aromatic green or greyish foliage | - |
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| arteriogram | (noun) an X ray of an artery filled with a contrast medium | - |
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| arthrogram | (noun) an X ray of a joint after the injection of a contrast medium | - |
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| arthromere | (noun) any of the segments in the body of a jointed animal like an arthropod | - |
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| artificialism | (noun) Czech surrealism founded in 1928 by Jindrich Styrsky and Toyen (Marie Cerminova). | - |
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| artilleryman | (noun) a serviceman in the artillery | Synonyms: cannoneer, gunner, machine gunner |
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| arum | (noun) any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe | Synonyms: aroid |
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| (noun) starch resembling sago that is obtained from cuckoopint root | - |
| asceticism | (noun) rigorous self-denial and active self-restraint | Synonyms: ascesis |
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| (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: austerity, nonindulgence |
| (noun) the doctrine that through renunciation of worldly pleasures it is possible to achieve a high spiritual or intellectual state | - |