| archduchy | (noun) the domain controlled by an archduke or archduchess | - |
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| archduke | (noun) a sovereign prince of the former ruling house of Austria | - |
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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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| archipallium | (noun) the olfactory cortex of the cerebrum | Synonyms: paleocortex |
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| architecture | (noun) the profession of designing buildings and environments with consideration for their esthetic effect | - |
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| (noun) an architectural product or work | - |
| (noun) (computer science) the structure and organization of a computer's hardware or system software | Synonyms: computer architecture |
| (noun) the discipline dealing with the principles of design and construction and ornamentation of fine buildings | - |
| architeuthis | (noun) largest mollusk known about but never seen (to 60 feet long) | Synonyms: giant squid |
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| archosaur | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaurian, archosaurian reptile |
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| archosaurian | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaur, archosaurian reptile |
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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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| arcus | (noun) a whitish deposit in the shape of an arc that is sometimes seen in the cornea | Synonyms: arcus senilis |
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| ardour | (noun) intense feeling of love | Synonyms: ardor |
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| (noun) a feeling of strong eagerness (usually in favor of a person or cause) | Synonyms: ardor, elan, zeal |
| (noun) feelings of great warmth and intensity | Synonyms: ardor, fervency, fervidness, fervor, fervour, fire |
| arduousness | (noun) extreme effortfulness | Synonyms: strenuousness |
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| arenavirus | (noun) animal viruses belonging to the family Arenaviridae | - |
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| arethusa | (noun) any of several bog orchids of the genus Arethusa having 1 or 2 showy flowers | - |
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| argentinosaur | (noun) huge herbivorous dinosaur of Cretaceous found in Argentina | - |
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| argonaut | (noun) someone engaged in a dangerous but potentially rewarding adventure | - |
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| arguer | (noun) someone who engages in debate | Synonyms: debater |
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| arguing | (noun) a contentious speech act; a dispute where there is strong disagreement | Synonyms: argument, contention, contestation, controversy, disceptation, disputation, tilt |
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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 |
| argus | (noun) large brilliantly patterned East Indian pheasant | Synonyms: argus pheasant |
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| 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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| 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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| 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 |
| arousal | (noun) the act of arousing | Synonyms: rousing |
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| (noun) mutual sexual fondling prior to sexual intercourse | Synonyms: foreplay, stimulation |
| (noun) awakening from sleep | - |
| (noun) a state of heightened physiological activity | - |
| arouser | (noun) someone who rouses others from sleep | Synonyms: rouser, waker |
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| arquebus | (noun) an obsolete firearm with a long barrel | Synonyms: hackbut, hagbut, harquebus |
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| artfulness | (noun) the quality of being adroit in taking unfair advantage | - |
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| articulateness | (noun) the quality of being facile in speech and writing | Synonyms: fluency, volubility |
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| articulatio | (noun) (anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion) | Synonyms: articulation, joint |
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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 |
| articulator | (noun) a movable speech organ | - |
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| (noun) someone who pronounces words | - |
| arugula | (noun) erect European annual often grown as a salad crop to be harvested when young and tender | Synonyms: Eruca sativa, Eruca vesicaria sativa, garden rocket, rocket, rocket salad, roquette |
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| arui | (noun) wild sheep of northern Africa | Synonyms: Ammotragus lervia, aoudad, audad, Barbary sheep, maned sheep |
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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 | - |
| ascus | (noun) saclike structure in which ascospores are formed through sexual reproduction of ascomycetes | - |
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| asexuality | (noun) having no evident sex or sex organs | Synonyms: sexlessness |
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| asparagus | (noun) edible young shoots of the asparagus plant | - |
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| (noun) plant whose succulent young shoots are cooked and eaten as a vegetable | Synonyms: Asparagus officinales, edible asparagus |
| aspersorium | (noun) the basin or other vessel that holds holy water in Roman Catholic Churches | - |
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| (noun) a short-handled device with a globe containing a sponge; used for sprinkling holy water | Synonyms: aspergill |
| assault | (noun) close fighting during the culmination of a military attack | - |
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| (noun) a threatened or attempted physical attack by someone who appears to be able to cause bodily harm if not stopped | - |
| (noun) the crime of forcing a person to submit to sexual intercourse against his or her will | Synonyms: rape, ravishment, violation |
| assaulter | (noun) someone who attacks | Synonyms: aggressor, assailant, attacker |
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| assiduity | (noun) great and constant diligence and attention | Synonyms: assiduousness, concentration |
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| assiduousness | (noun) great and constant diligence and attention | Synonyms: assiduity, concentration |
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| assuagement | (noun) the feeling that comes when something burdensome is removed or reduced | Synonyms: alleviation, relief |
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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 |
| assurance | (noun) freedom from doubt; belief in yourself and your abilities | Synonyms: authority, confidence, self-assurance, self-confidence, sureness |
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| (noun) a statement intended to inspire confidence | - |
| (noun) a binding commitment to do or give or refrain from something | Synonyms: pledge |
| (noun) a British term for some kinds of insurance | - |
| assuredness | (noun) great coolness and composure under strain | Synonyms: aplomb, cool, poise, sang-froid |
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| astragalus | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: anklebone, astragal, talus |
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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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| astuteness | (noun) intelligence manifested by being astute (as in business dealings) | Synonyms: perspicaciousness, perspicacity, shrewdness |
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| (noun) the intellectual ability to penetrate deeply into ideas | Synonyms: deepness, depth, profoundness, profundity |
| asylum | (noun) a hospital for mentally incompetent or unbalanced person | Synonyms: insane asylum, institution, mental home, mental hospital, mental institution, psychiatric hospital |
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| (noun) a shelter from danger or hardship | Synonyms: refuge, sanctuary |
| athenaeum | (noun) a place where reading materials are available | Synonyms: atheneum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: atheneum |
| atheneum | (noun) a place where reading materials are available | Synonyms: athenaeum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: athenaeum |
| atrium | (noun) the central area in a building; open to the sky | - |
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| (noun) any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart) | - |
| atrociousness | (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrocity, barbarity, barbarousness, heinousness |
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| attenuation | (noun) the property of something that has been weakened or reduced in thickness or density | - |
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| (noun) weakening in force or intensity | Synonyms: fading |
| attenuator | (noun) an electrical device for attenuating the strength of an electrical signal | - |
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| attitude | (noun) a theatrical pose created for effect | - |
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| (noun) the arrangement of the body and its limbs | Synonyms: position, posture |
| (noun) a complex mental state involving beliefs and feelings and values and dispositions to act in certain ways | Synonyms: mental attitude |
| (noun) position of aircraft or spacecraft relative to a frame of reference (the horizon or direction of motion) | - |
| attribute | (noun) an abstraction belonging to or characteristic of an entity | - |
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| (noun) a construct whereby objects or individuals can be distinguished | Synonyms: dimension, property |
| attribution | (noun) assigning to a cause or source | Synonyms: ascription |
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| (noun) assigning some quality or character to a person or thing | Synonyms: ascription |
| auberge | (noun) a hotel providing overnight lodging for travelers | Synonyms: hostel, hostelry, inn, lodge |
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| aubergine | (noun) egg-shaped vegetable having a shiny skin typically dark purple but occasionally white or yellow | Synonyms: eggplant, mad apple |
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| (noun) hairy upright herb native to southeastern Asia but widely cultivated for its large glossy edible fruit commonly used as a vegetable | Synonyms: brinjal, eggplant, eggplant bush, garden egg, mad apple, Solanum melongena |
| auction | (noun) the public sale of something to the highest bidder | Synonyms: auction sale, vendue |
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| (noun) a variety of bridge in which tricks made in excess of the contract are scored toward game; now generally superseded by contract bridge | Synonyms: auction bridge |
| auctioneer | (noun) an agent who conducts an auction | - |
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| audaciousness | (noun) fearless daring | Synonyms: audacity, temerity |
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| (noun) aggressive boldness or unmitigated effrontery | Synonyms: audacity |
| audacity | (noun) fearless daring | Synonyms: audaciousness, temerity |
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| (noun) aggressive boldness or unmitigated effrontery | Synonyms: audaciousness |
| audad | (noun) wild sheep of northern Africa | Synonyms: Ammotragus lervia, aoudad, arui, Barbary sheep, maned sheep |
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| audibility | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibleness |
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| audible | (noun) a football play is changed orally after both teams have assumed their positions at the line of scrimmage | - |
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| audibleness | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibility |
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| audience | (noun) a conference (usually with someone important) | Synonyms: consultation, interview |
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| (noun) a gathering of spectators or listeners at a (usually public) performance | - |
| (noun) the part of the general public interested in a source of information, entertainment, or a product/service | - |
| (noun) an opportunity to state your case and be heard | Synonyms: hearing |
| audile | (noun) one whose mental imagery is auditory rather than visual or motor | - |
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| audio | (noun) the sound elements of television | - |
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| (noun) a recording of acoustic signals | Synonyms: audio recording, sound recording |
| (noun) an audible acoustic wave frequency | Synonyms: audio frequency |
| (noun) the audible part of a transmitted signal | Synonyms: sound |
| audiocassette | (noun) a cassette for audiotape | - |
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| audiogram | (noun) a graphical representation of a person's auditory sensitivity to sound | - |
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| audiology | (noun) the measurement of hearing | Synonyms: audiometry |
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| audiometer | (noun) an instrument used to measure the sensitivity of hearing | Synonyms: sonometer |
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| audiometry | (noun) measuring sensitivity of hearing | - |
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| (noun) the measurement of hearing | Synonyms: audiology |
| audiotape | (noun) magnetic tape for use in recording sound | - |
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| (noun) a tape recording of sound | - |
| audiovisual | (noun) materials using sight or sound to present information | Synonyms: audiovisual aid |
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| audit | (noun) a methodical examination or review of a condition or situation | - |
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| (noun) an inspection of the accounting procedures and records by a trained accountant or CPA | Synonyms: audited account |
| audition | (noun) a test of the suitability of a performer | Synonyms: tryout |
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| (noun) the ability to hear; the auditory faculty | Synonyms: auditory modality, auditory sense, hearing, sense of hearing |
| auditor | (noun) a qualified accountant who inspects the accounting records and practices of a business or other organization | - |
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| (noun) someone who listens attentively | Synonyms: attender, hearer, listener |
| (noun) a student who attends a course but does not take it for credit | - |
| auditorium | (noun) the area of a theater or concert hall where the audience sits | - |
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| augend | (noun) a number to which another number (the addend) is added | - |
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| auger | (noun) hand tool for boring holes | Synonyms: gimlet, screw auger, wimble |
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| (noun) a long flexible steel coil for dislodging stoppages in curved pipes | Synonyms: plumber's snake, snake |
| aught | (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: cipher, cypher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zip, zippo |
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| augite | (noun) dark-green to black glassy mineral of the pyroxene group containing large amounts of aluminum and iron and magnesium | - |
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| augmentation | (noun) the act of augmenting | - |
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| (noun) the statement of a theme in notes of greater duration (usually twice the length of the original) | - |
| (noun) the amount by which something becomes greater | - |
| augur | (noun) (ancient Rome) a religious official who interpreted omens to guide public policy | Synonyms: auspex |
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| augury | (noun) an event that is experienced as indicating important things to come | Synonyms: foretoken, preindication, sign |
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| auk | (noun) black-and-white short-necked web-footed diving bird of northern seas | - |
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| auklet | (noun) any of several small auks of the northern Pacific coasts | - |
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| aunt | (noun) the sister of your father or mother; the wife of your uncle | Synonyms: auntie, aunty |
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