| abbreviate | (verb) shorten | - |
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| (verb) reduce in scope while retaining essential elements | Synonyms: abridge, contract, cut, foreshorten, reduce, shorten |
| abbreviated | (adjective) (of clothing) very short | Synonyms: brief |
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| (adjective) cut short in duration | Synonyms: shortened, truncated |
| abbreviation | (noun) shortening something by omitting parts of it | - |
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| (noun) a shortened form of a word or phrase | - |
| abbreviator | (noun) one who shortens or abridges or condenses a written work | Synonyms: abridger |
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| absolvitory | (adjective) providing absolution | Synonyms: exonerative, forgiving |
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| absorptivity | (noun) (physics) the property of a body that determines the fraction of the incident radiation or sound flux absorbed or absorbable by the body | Synonyms: absorption factor |
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| acclivitous | (adjective) sloping upward | Synonyms: rising, uphill |
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| acclivity | (noun) an upward slope or grade (as in a road) | Synonyms: ascent, climb, raise, rise, upgrade |
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| activism | (noun) a policy of taking direct action to achieve a political or social goal | - |
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| activist | (adjective) advocating or engaged in activism | Synonyms: activistic |
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| (noun) a militant reformer | Synonyms: militant |
| activistic | (adjective) advocating or engaged in activism | Synonyms: activist |
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| activity | (noun) any specific behavior | - |
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| (noun) the trait of being active; moving or acting rapidly and energetically | Synonyms: activeness |
| (noun) an organic process that takes place in the body | Synonyms: bodily function, bodily process, body process |
| (noun) a process existing in or produced by nature (rather than by the intent of human beings) | Synonyms: action, natural action, natural process |
| (noun) the state of being active | Synonyms: action, activeness |
| (noun) (chemistry) the capacity of a substance to take part in a chemical reaction | - |
| acyclovir | (noun) an oral antiviral drug (trade name Zovirax) used to treat genital herpes; does not cure the disease but relieves the symptoms | Synonyms: Zovirax |
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| adenovirus | (noun) any of a group of viruses including those that in humans cause upper respiratory infections or infectious pinkeye | - |
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| administrivia | (noun) the tiresome but essential details that must be taken care of and tasks that must be performed in running an organization | - |
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| advice | (noun) a proposal for an appropriate course of action | - |
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| advisability | (noun) the quality of being advisable | - |
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| advisable | (adjective) worthy of being recommended or suggested; prudent or wise | - |
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| advise | (verb) give advice to | Synonyms: counsel, rede |
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| (verb) inform (somebody) of something | Synonyms: apprise, apprize, give notice, notify, send word |
| (verb) make a proposal, declare a plan for something | Synonyms: propose, suggest |
| advised | (adjective) having the benefit of careful prior consideration or counsel | Synonyms: well-advised |
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| (adjective) having received information | - |
| advisedly | (adverb) with intention; in an intentional manner | Synonyms: by choice, by design, deliberately, designedly, intentionally, on purpose, purposely |
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| advisee | (noun) someone who receives advice | - |
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| advisement | (noun) careful consideration | Synonyms: deliberation, weighing |
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| adviser | (noun) an expert who gives advice | Synonyms: advisor, consultant |
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| advisor | (noun) an expert who gives advice | Synonyms: adviser, consultant |
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| advisory | (adjective) giving advice | Synonyms: consultative, consultatory, consultive |
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| (noun) an announcement that usually advises or warns the public of some threat | - |
| affidavit | (noun) written declaration made under oath; a written statement sworn to be true before someone legally authorized to administer an oath | - |
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| akvavit | (noun) Scandinavian liquor usually flavored with caraway seeds | Synonyms: aquavit |
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| alleviant | (noun) remedy that alleviates pain without curing | Synonyms: alleviator, palliative |
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| alleviate | (verb) provide physical relief, as from pain | Synonyms: assuage, palliate, relieve |
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| (verb) make easier | Synonyms: ease, facilitate |
| alleviated | (adjective) (of pain or sorrow) made easier to bear | Synonyms: eased, relieved |
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| alleviation | (noun) the act of reducing something unpleasant (as pain or annoyance) | Synonyms: easement, easing, relief |
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| (noun) the feeling that comes when something burdensome is removed or reduced | Synonyms: assuagement, relief |
| alleviative | (adjective) moderating pain or sorrow by making it easier to bear | Synonyms: alleviatory, lenitive, mitigative, mitigatory, palliative |
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| alleviator | (noun) remedy that alleviates pain without curing | Synonyms: alleviant, palliative |
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| (noun) a therapist who makes suffering more endurable | - |
| alleviatory | (adjective) moderating pain or sorrow by making it easier to bear | Synonyms: alleviative, lenitive, mitigative, mitigatory, palliative |
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| alluvial | (adjective) of or relating to alluvium | - |
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| alluviation | (noun) the phenomenon of sediment or gravel accumulating | Synonyms: deposit, sedimentation |
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| alluvion | (noun) clay or silt or gravel carried by rushing streams and deposited where the stream slows down | Synonyms: alluvial deposit, alluvial sediment, alluvium |
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| (noun) the rising of a body of water and its overflowing onto normally dry land | Synonyms: deluge, flood, inundation |
| (noun) gradual formation of new land, by recession of the sea or deposit of sediment | - |
| alluvium | (noun) clay or silt or gravel carried by rushing streams and deposited where the stream slows down | Synonyms: alluvial deposit, alluvial sediment, alluvion |
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| almsgiving | (noun) making voluntary contributions to aid the poor | Synonyms: alms-giving |
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| alphavirus | (noun) an arbovirus of the family Togaviridae that can cause a variety of encephalitis in horses | - |
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| alvine | (adjective) of or relating to the intestines | - |
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| antediluvial | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvian |
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| antediluvian | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvial |
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| (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antiquated, archaic |
| (noun) a very old person | Synonyms: ancient |
| (noun) any of the early patriarchs who lived prior to the Noachian deluge | Synonyms: antediluvian patriarch |
| antiviral | (adjective) inhibiting or stopping the growth and reproduction of viruses | - |
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| (noun) any drug that destroys viruses | Synonyms: antiviral agent, antiviral drug |
| anvil | (noun) a heavy block of iron or steel on which hot metals are shaped by hammering | - |
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| (noun) a small bone in the middle ear between the malleus and the stapes | Synonyms: incus |
| approving | (adjective) expressing or manifesting praise or approval | Synonyms: affirmative, approbative, approbatory, plausive |
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| (noun) the formal act of approving | Synonyms: approval, blessing |
| approvingly | (adverb) in an approving manner | - |
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| aquavit | (noun) Scandinavian liquor usually flavored with caraway seeds | Synonyms: akvavit |
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| arborvirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arbovirus |
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| arborvitae | (noun) any of several Asian and North American conifers of the genera Thuja and Thujopsis | - |
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| arbovirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arborvirus |
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| archivist | (noun) a person in charge of collecting and cataloguing archives | - |
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| arenavirus | (noun) animal viruses belonging to the family Arenaviridae | - |
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| arriviste | (noun) a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class | Synonyms: nouveau-riche, parvenu, upstart |
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| astronavigation | (noun) navigating according to the positions of the stars | Synonyms: celestial navigation |
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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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| audiovisual | (adjective) involving both hearing and seeing (usually relating to teaching aids) | - |
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| (noun) materials using sight or sound to present information | Synonyms: audiovisual aid |
| avian | (adjective) pertaining to or characteristic of birds | - |
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| avianise | (verb) to modify microorganisms by repeated culture in the developing chick embryo | Synonyms: avianize |
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| avianize | (verb) to modify microorganisms by repeated culture in the developing chick embryo | Synonyms: avianise |
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| aviary | (noun) a building where birds are kept | Synonyms: bird sanctuary, volary |
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| aviate | (verb) operate an airplane | Synonyms: fly, pilot |
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| aviation | (noun) travel via aircraft | Synonyms: air, air travel |
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| (noun) the art of operating aircraft | Synonyms: airmanship |
| (noun) the aggregation of a country's military aircraft | Synonyms: air power |
| (noun) the operation of aircraft to provide transportation | - |
| aviator | (noun) someone who operates an aircraft | Synonyms: aeronaut, flier, flyer |
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| aviatress | (noun) a woman aviator | Synonyms: airwoman, aviatrix |
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| aviatrix | (noun) a woman aviator | Synonyms: airwoman, aviatress |
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| avid | (adjective) (often followed by `for') ardently or excessively desirous | Synonyms: devouring, esurient, greedy |
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| (adjective) marked by active interest and enthusiasm | Synonyms: zealous |
| avidity | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidness, eagerness, keenness |
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| avidly | (adverb) in an avid manner | - |
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| avidness | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidity, eagerness, keenness |
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| avifauna | (noun) the birds of a particular region or period | - |
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| avifaunal | (adjective) of or relating to birds of a particular region or period | Synonyms: avifaunistic |
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| avifaunistic | (adjective) of or relating to birds of a particular region or period | Synonyms: avifaunal |
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| avionic | (adjective) of or relating to avionics | - |
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| avionics | (noun) science and technology of electronic systems and devices for aeronautics and astronautics | - |
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| avirulent | (adjective) not virulent; unable to produce disease | - |
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| avitaminosis | (noun) any of several diseases caused by deficiency of one or more vitamins | Synonyms: hypovitaminosis |
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| avitaminotic | (adjective) of or relating to or characteristic of avitaminosis | - |
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| bedevil | (verb) be confusing or perplexing to; cause to be unable to think clearly | Synonyms: befuddle, confound, confuse, discombobulate, fox, fuddle, throw |
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| (verb) treat cruelly | Synonyms: crucify, dun, frustrate, rag, torment |
| bedevilment | (noun) the act of harassing someone | Synonyms: badgering, torment, worrying |
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| behavior | (noun) manner of acting or controlling yourself | Synonyms: behaviour, conduct, doings |
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| (noun) (psychology) the aggregate of the responses or reactions or movements made by an organism in any situation | Synonyms: behaviour |
| (noun) (behavioral attributes) the way a person behaves toward other people | Synonyms: behaviour, conduct, demeanor, demeanour, deportment |
| (noun) the action or reaction of something (as a machine or substance) under specified circumstances | Synonyms: behaviour |
| behavioral | (adjective) of or relating to behavior | Synonyms: behavioural |
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| behaviorism | (noun) an approach to psychology that emphasizes observable measurable behavior | Synonyms: behavioristic psychology, behaviourism, behaviouristic psychology |
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| behaviorist | (adjective) of or relating to behaviorism | Synonyms: behavioristic, behaviourist, behaviouristic |
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| (noun) a psychologist who subscribes to behaviorism | Synonyms: behaviourist |
| behavioristic | (adjective) of or relating to behaviorism | Synonyms: behaviorist, behaviourist, behaviouristic |
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| behaviour | (noun) manner of acting or controlling yourself | Synonyms: behavior, conduct, doings |
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| (noun) (psychology) the aggregate of the responses or reactions or movements made by an organism in any situation | Synonyms: behavior |
| (noun) (behavioral attributes) the way a person behaves toward other people | Synonyms: behavior, conduct, demeanor, demeanour, deportment |
| (noun) the action or reaction of something (as a machine or substance) under specified circumstances | Synonyms: behavior |
| behavioural | (adjective) of or relating to behavior | Synonyms: behavioral |
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| behaviourism | (noun) an approach to psychology that emphasizes observable measurable behavior | Synonyms: behaviorism, behavioristic psychology, behaviouristic psychology |
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| behaviourist | (adjective) of or relating to behaviorism | Synonyms: behaviorist, behavioristic, behaviouristic |
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| (noun) a psychologist who subscribes to behaviorism | Synonyms: behaviorist |
| behaviouristic | (adjective) of or relating to behaviorism | Synonyms: behaviorist, behavioristic, behaviourist |
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| believing | (noun) the cognitive process that leads to convictions | - |
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| believingly | (adverb) in a credulous manner | Synonyms: credulously |
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| bioflavinoid | (noun) a vitamin that maintains the resistance of cell and capillary walls to permeation | Synonyms: citrin, vitamin P |
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| bloviate | (verb) orate verbosely and windily | - |
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| bolivia | (noun) a form of canasta in which sequences can be melded | - |
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| boliviano | (noun) the basic unit of money in Bolivia; equal to 100 centavos | - |
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| bolshevise | (verb) make Communist or bring in accord with Communist principles | Synonyms: bolshevize, communise, communize |
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