| antagonistically | (adverb) in an antagonistic manner | - |
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| antagonize | (verb) provoke the hostility of | Synonyms: antagonise |
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| (verb) act in opposition to | Synonyms: antagonise, counteract |
| antapex | (noun) the point opposite in direction from the solar apex; the point the solar system is moving away from | - |
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| antecubital | (adjective) of or relating to the region of the arm in front of the elbow | - |
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| antenatal | (adjective) occurring or existing before birth | Synonyms: antepartum, prenatal |
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| antiauthoritarian | (adjective) opposed to authoritarianism | - |
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| anticatalyst | (noun) (chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst | - |
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| antidotal | (adjective) counteracting the effects of a poison | - |
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| antiestablishmentarianism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentism |
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| antiestablishmentism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentarianism |
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| antihistamine | (noun) a medicine used to treat allergies and hypersensitive reactions and colds; works by counteracting the effects of histamine on a receptor site | - |
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| antimetabolite | (noun) an antineoplastic drug that inhibits the utilization of a metabolite | - |
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| antimetathesis | (noun) A rhetorical figure resulting from a reverted arrangement in the last clause of a sentence of the two principal words of the clause preceding; inversion of the members of an antithesis: as, "A poem is a speaking picture; a picture a mute poem". | - |
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| antitank | (adjective) designed for defense against armored vehicles | - |
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| antitauon | (noun) an antilepton of very great mass | Synonyms: tau-plus particle |
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| aorta | (noun) the large trunk artery that carries blood from the left ventricle of the heart to branch arteries | - |
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| aortal | (adjective) of or relating to the aorta | Synonyms: aortic |
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| apetalous | (adjective) (of flowers) having no petals | Synonyms: petalless |
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| aplacental | (adjective) having no placenta | - |
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| apostasy | (noun) the act of abandoning a party for cause | Synonyms: tergiversation |
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| (noun) the state of having rejected your religious beliefs for your political party or a cause (often in favor of opposing beliefs or causes) | Synonyms: defection, renunciation |
| apostate | (adjective) not faithful to religion or party or cause | - |
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| (noun) a disloyal person who betrays or deserts his cause or religion or political party or friend etc. | Synonyms: deserter, ratter, recreant, renegade, turncoat |
| apostatise | (verb) abandon one's beliefs or allegiances | Synonyms: apostatize, tergiversate |
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| apostatize | (verb) abandon one's beliefs or allegiances | Synonyms: apostatise, tergiversate |
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| appertain | (verb) be a part or attribute of | Synonyms: pertain |
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| arborvitae | (noun) any of several Asian and North American conifers of the genera Thuja and Thujopsis | - |
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| arccotangent | (noun) the inverse function of the cotangent; the angle that has a cotangent equal to a given number | Synonyms: arc cotangent, inverse cotangent |
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| arctan | (noun) the inverse function of the tangent; the angle that has a tangent equal to a given number | Synonyms: arc tangent, arctangent, inverse tangent |
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| arctangent | (noun) the inverse function of the tangent; the angle that has a tangent equal to a given number | Synonyms: arc tangent, arctan, inverse tangent |
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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 |
| argumentative | (adjective) given to or characterized by argument | - |
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| argumentatively | (adverb) in a disputatious manner | Synonyms: disputatiously |
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| arietta | (noun) a short aria | Synonyms: short aria |
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| arista | (noun) bristlelike process near the tip of the antenna of certain flies | - |
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| armamentarium | (noun) the collection of equipment and methods used in the practice of medicine | - |
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| arteriectasia | (noun) an abnormal distension of an artery | Synonyms: arteriectasis |
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| arteriectasis | (noun) an abnormal distension of an artery | Synonyms: arteriectasia |
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| arytaenoid | (noun) either of two small cartilages at the back of the larynx to which the vocal folds are attached | Synonyms: arytenoid, arytenoid cartilage |
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| ascertain | (verb) be careful or certain to do something; make certain of something | Synonyms: assure, check, control, ensure, insure, see, see to it |
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| (verb) learn or discover with certainty | - |
| (verb) find out, learn, or determine with certainty, usually by making an inquiry or other effort | Synonyms: check, determine, find out, learn, see, watch |
| (verb) establish after a calculation, investigation, experiment, survey, or study | Synonyms: determine, find, find out |
| ascertainable | (adjective) capable of being ascertained or found out | Synonyms: discoverable |
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| ascertained | (adjective) discovered or determined by scientific observation | Synonyms: discovered, observed |
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| aspartame | (noun) an artificial sweetener made from aspartic acid; used as a calorie-free sweetener | - |
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| assertable | (adjective) capable of being affirmed or asserted | Synonyms: affirmable |
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| assistance | (noun) the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: aid, assist, help |
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| (noun) a person or thing that is a resource that helps make something easier or possible to do | Synonyms: aid, help |
| (noun) gift of money or other material help to support a person or cause | Synonyms: aid, economic aid, economic assistance, financial aid, financial assistance |
| assistant | (adjective) of or relating to a person who is subordinate to another | Synonyms: adjunct |
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| (noun) a person who contributes to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: help, helper, supporter |
| astasia | (noun) inability to stand due to muscular incoordination | - |
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| astatic | (adjective) not static or stable | - |
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| astatine | (noun) a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium | Synonyms: At, atomic number 85 |
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| astomatal | (adjective) lacking a stoma or stomata | - |
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| atactic | (adjective) lacking motor coordination; marked or caused by ataxia | Synonyms: ataxic |
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| atar | (noun) essential oil or perfume obtained from flowers | Synonyms: athar, attar, ottar |
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| ataractic | (adjective) tending to soothe or tranquilize | Synonyms: ataraxic, sedative, tranquilising, tranquilizing, tranquillising, tranquillizing |
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| (noun) a drug used to reduce stress or tension without reducing mental clarity | Synonyms: antianxiety agent, ataractic agent, ataractic drug, tranquilizer, tranquilliser, tranquillizer |
| ataraxia | (noun) peace of mind | - |
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| ataraxic | (adjective) tending to soothe or tranquilize | Synonyms: ataractic, sedative, tranquilising, tranquilizing, tranquillising, tranquillizing |
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| ataraxis | (noun) the absence of mental stress or anxiety | Synonyms: heartsease, peace, peace of mind, peacefulness, repose, serenity |
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| atavism | (noun) a reappearance of an earlier characteristic | Synonyms: reversion, throwback |
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| atavist | (noun) an organism that has the characteristics of a more primitive type of that organism | Synonyms: throwback |
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| atavistic | (adjective) characteristic of an atavist | Synonyms: throwback |
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| ataxia | (noun) inability to coordinate voluntary muscle movements; unsteady movements and staggering gait | Synonyms: ataxy, dyssynergia, motor ataxia |
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| ataxic | (adjective) lacking motor coordination; marked or caused by ataxia | Synonyms: atactic |
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| ataxy | (noun) inability to coordinate voluntary muscle movements; unsteady movements and staggering gait | Synonyms: ataxia, dyssynergia, motor ataxia |
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| atelectasis | (noun) collapse of an expanded lung (especially in infants); also failure of pulmonary alveoli to expand at birth | - |
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| atorvastatin | (noun) an oral drug (trade name Lipitor) that is effective in lowering triglycerides; potent in reducing LDL cholesterol because higher doses can be given | Synonyms: Lipitor |
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| attach | (verb) become attached | - |
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| (verb) cause to be attached | - |
| (verb) be attached; be in contact with | - |
| (verb) take temporary possession of as a security, by legal authority | Synonyms: confiscate, impound, seize, sequester |
| (verb) create social or emotional ties | Synonyms: bind, bond, tie |
| attachable | (adjective) capable of being fastened or added to something else | - |
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| attache | (noun) a shallow and rectangular briefcase | Synonyms: attache case |
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| (noun) a specialist assigned to the staff of a diplomatic mission | - |
| attached | (adjective) associated in an exclusive sexual relationship | Synonyms: committed |
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| (adjective) used of buildings joined by common sidewalls | - |
| (adjective) fond and affectionate | - |
| (adjective) being joined in close association | Synonyms: affiliated, connected |
| attachment | (noun) the act of fastening things together | Synonyms: fastening |
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| (noun) the act of attaching or affixing something | Synonyms: affixation |
| (noun) faithful support for a cause or political party or religion | Synonyms: adherence, adhesion |
| (noun) a supplementary part or accessory | - |
| (noun) a connection that fastens things together | Synonyms: bond |
| (noun) a writ authorizing the seizure of property that may be needed for the payment of a judgment in a judicial proceeding | - |
| (noun) a feeling of affection for a person or an institution | Synonyms: fond regard |
| attack | (noun) (military) an offensive against an enemy (using weapons) | Synonyms: onrush, onset, onslaught |
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| (noun) a decisive manner of beginning a musical tone or phrase | Synonyms: tone-beginning |
| (noun) the act of attacking | Synonyms: attempt |
| (noun) ideas or actions intended to deal with a problem or situation | Synonyms: approach, plan of attack |
| (noun) an offensive move in a sport or game | - |
| (noun) strong criticism | - |
| (noun) intense adverse criticism | Synonyms: blast, fire, flack, flak |
| (noun) the onset of a corrosive or destructive process (as by a chemical agent) | - |
| (noun) a sudden occurrence of an uncontrollable condition | - |
| (verb) begin to injure | - |
| (verb) set to work upon; turn one's energies vigorously to a task | - |
| (verb) attack in speech or writing | Synonyms: assail, assault, lash out, round, snipe |
| (verb) launch an attack or assault on; begin hostilities or start warfare with | Synonyms: assail |
| (verb) take the initiative and go on the offensive | Synonyms: aggress |
| (verb) attack someone physically or emotionally | Synonyms: assail, assault, set on |
| attacker | (noun) someone who attacks | Synonyms: aggressor, assailant, assaulter |
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| attacking | (adjective) disposed to attack | Synonyms: assaultive |
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| attain | (verb) reach a point in time, or a certain state or level | Synonyms: hit, reach |
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| (verb) reach a destination, either real or abstract | Synonyms: arrive at, gain, hit, make, reach |
| (verb) find unexpectedly | Synonyms: chance on, chance upon, come across, come upon, discover, fall upon, happen upon, light upon, strike |
| (verb) to gain with effort | Synonyms: accomplish, achieve, reach |
| attainability | (noun) the state of being achievable | Synonyms: achievability, attainableness |
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| attainable | (adjective) capable of being attained or accomplished | Synonyms: come-at-able |
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| attainableness | (noun) the state of being achievable | Synonyms: achievability, attainability |
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| attainder | (noun) cancellation of civil rights | Synonyms: civil death |
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| attained | (adjective) achieved or reached | - |
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| attainment | (noun) the act of achieving an aim | - |
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| (noun) arrival at a new stage | - |
| (noun) an ability that has been acquired by training | Synonyms: accomplishment, acquirement, acquisition, skill |
| attaint | (verb) condemn by attainder | - |
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| (verb) bring shame or dishonor upon | Synonyms: disgrace, dishonor, dishonour, shame |
| attar | (noun) essential oil or perfume obtained from flowers | Synonyms: atar, athar, ottar |
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| attestant | (noun) (law) a person who attests to the genuineness of a document or signature by adding their own signature | Synonyms: attestator, attestor, witness |
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| (noun) someone who affirms or vouches for the correctness or truth or genuineness of something | Synonyms: attester |
| attestation | (noun) the action of bearing witness | - |
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| (noun) the evidence by which something is attested | - |
| attestator | (noun) (law) a person who attests to the genuineness of a document or signature by adding their own signature | Synonyms: attestant, attestor, witness |
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| attractable | (adjective) capable of being magnetized or attracted by a magnet | - |
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| attributable | (adjective) capable of being attributed | - |
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| audiotape | (noun) magnetic tape for use in recording sound | - |
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| (noun) a tape recording of sound | - |
| 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 | - |
| augmentative | (adjective) increasing or having the power to increase especially in size or amount or degree | - |
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| (adjective) intensifying by augmentation and enhancement | Synonyms: enhancive |
| auscultate | (verb) examine by auscultation | - |
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| auscultation | (noun) listening to sounds within the body (usually with a stethoscope) | - |
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| auscultatory | (adjective) of or relating to auscultation | - |
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| autacoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autocoid |
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| autacoidal | (adjective) of or relating to an autacoid | - |
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| autarchic | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchical, autarkical |
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| autarchical | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchic, autarkical |
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| autarchy | (noun) a political system governed by a single individual | Synonyms: autocracy |
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| (noun) economic independence as a national policy | Synonyms: autarky |
| autarkic | (adjective) of countries; not relying on imports | Synonyms: autarkical |
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| autarkical | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchic, autarchical |
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| (adjective) of countries; not relying on imports | Synonyms: autarkic |
| autarky | (noun) economic independence as a national policy | Synonyms: autarchy |
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| authoritarian | (adjective) expecting unquestioning obedience | Synonyms: dictatorial, overbearing |
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| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: autocratic, despotic, dictatorial, tyrannic, tyrannical |
| (noun) a person who behaves in a tyrannical manner | Synonyms: dictator |
| authoritarianism | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny |
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