| ability | (noun) the quality of being able to perform; a quality that permits or facilitates achievement or accomplishment | - |
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| (noun) possession of the qualities (especially mental qualities) required to do something or get something done | Synonyms: power |
| abnormality | (noun) behavior that breaches the rule or etiquette or custom or morality | Synonyms: irregularity |
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| (noun) marked strangeness as a consequence of being abnormal | Synonyms: freakishness |
| (noun) retardation sufficient to fall outside the normal range of intelligence | Synonyms: mental defectiveness |
| (noun) an abnormal physical condition resulting from defective genes or developmental deficiencies | Synonyms: abnormalcy |
| abolition | (noun) the act of abolishing a system or practice or institution (especially abolishing slavery) | Synonyms: abolishment |
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| abolitionary | (adjective) relating to or favoring abolition, especially abolition of slavery | - |
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| abolitionism | (noun) the doctrine that calls for the abolition of slavery | - |
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| abolitionist | (noun) a reformer who favors abolishing slavery | Synonyms: emancipationist |
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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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| abstrusity | (noun) wisdom that is recondite and abstruse and profound | Synonyms: abstruseness, profoundness, profundity, reconditeness |
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| absurdity | (noun) a ludicrous folly | Synonyms: fatuity, fatuousness, silliness |
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| (noun) a message whose content is at variance with reason | Synonyms: absurdness, ridiculousness |
| acceptability | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptableness |
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| accessibility | (noun) the quality of being at hand when needed | Synonyms: availability, availableness, handiness |
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| (noun) the attribute of being easy to meet or deal with | Synonyms: approachability |
| accipitrine | (adjective) of or relating to or belonging to the genus Accipiter (or to typical hawks) | - |
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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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| accountability | (noun) responsibility to someone or for some activity | Synonyms: answerability, answerableness |
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| accredit | (verb) ascribe an achievement to | Synonyms: credit |
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| (verb) grant credentials to | Synonyms: recognise, recognize |
| (verb) provide or send (envoys or ambassadors) with official credentials | - |
| accreditation | (noun) the act of granting credit or recognition (especially with respect to an educational institution that maintains suitable standards) | - |
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| accredited | (adjective) given official approval to act | Synonyms: commissioned, licenced, licensed |
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| acerbity | (noun) a rough and bitter manner | Synonyms: acrimony, bitterness, jaundice, tartness, thorniness |
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| (noun) a sharp sour taste | Synonyms: tartness |
| (noun) a sharp bitterness | - |
| achievability | (noun) the state of being achievable | Synonyms: attainability, attainableness |
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| achondrite | (noun) a stony meteor lacking chondrules | - |
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| achondritic | (adjective) not having a granular structure | - |
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| (adjective) of or related to an achondrite | - |
| achromaticity | (noun) the visual property of being without chromatic color | Synonyms: achromatism, colorlessness, colourlessness |
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| acidity | (noun) pH values below 7 | - |
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| (noun) the property of being acidic | Synonyms: sour, sourness |
| (noun) the taste experience when something acidic is taken into the mouth | Synonyms: acidulousness |
| aconite | (noun) any of various usually poisonous plants of the genus Aconitum having tuberous roots and palmately lobed leaves and blue or white flowers | - |
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| acquisition | (noun) the act of contracting or assuming or acquiring possession of something | - |
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| (noun) an ability that has been acquired by training | Synonyms: accomplishment, acquirement, attainment, skill |
| (noun) the cognitive process of acquiring skill or knowledge | Synonyms: learning |
| (noun) something acquired | - |
| acquisitive | (adjective) eager to acquire and possess things especially material possessions or ideas | - |
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| acquisitiveness | (noun) strong desire to acquire and possess | - |
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| acquit | (verb) behave in a certain manner; show a certain behavior; conduct or comport oneself | Synonyms: act, bear, behave, carry, comport, conduct, deport, do |
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| (verb) pronounce not guilty of criminal charges | Synonyms: assoil, clear, discharge, exculpate, exonerate |
| acquittal | (noun) a judgment of not guilty | - |
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| acquittance | (noun) a legal document evidencing the discharge of a debt or obligation | Synonyms: release |
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| acquitted | (adjective) declared not guilty of a specific offense or crime; legally blameless | Synonyms: not guilty |
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| acridity | (noun) extreme bitterness | Synonyms: acridness |
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| (noun) the quality of being sharply disagreeable in language or tone | Synonyms: acridness |
| (noun) having an acrid smell | - |
| acritical | (adjective) without a crisis (as of some diseases) | - |
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| acrylonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: propenonitrile, vinyl cyanide |
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| actinolite | (noun) a green mineral of the amphibole group; calcium magnesium iron silicate | - |
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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 | - |
| actuality | (noun) the state of actually existing objectively | - |
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| acuity | (noun) a quick and penetrating intelligence | Synonyms: acuteness, keenness, sharpness |
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| (noun) sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart) | Synonyms: sharp-sightedness, visual acuity |
| adaptability | (noun) the ability to change (or be changed) to fit changed circumstances | - |
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| addition | (noun) the arithmetic operation of summing; calculating the sum of two or more numbers | Synonyms: plus, summation |
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| (noun) the act of adding one thing to another | - |
| (noun) a component that is added to something to improve it | Synonyms: add-on, improver |
| (noun) a suburban area laid out in streets and lots for a future residential area | - |
| (noun) something added to what you already have | Synonyms: accession |
| (noun) a quantity that is added | Synonyms: gain, increase |
| additional | (adjective) further or added | Synonyms: extra |
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| additionally | (adverb) in addition, by way of addition; furthermore | Synonyms: to boot |
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| additive | (adjective) characterized or produced by addition | - |
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| (adjective) designating or involving an equation whose terms are of the first degree | Synonyms: linear |
| (noun) something added to enhance food or gasoline or paint or medicine | - |
| adenitis | (noun) inflammation of a gland or lymph node | - |
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| adesite | (noun) dark greyish extrusive rock | - |
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| adiabaticity | (noun) The condition of occurring without gain or loss of heat (and thus with no change in entropy, in the quasistatic approximation). | - |
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| adiposity | (noun) having the property of containing fat | Synonyms: adiposeness, fattiness |
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| adit | (noun) a nearly horizontal passage from the surface into a mine | - |
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| admirability | (noun) admirable excellence | Synonyms: admirableness, wonderfulness |
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| admissibility | (noun) acceptability by virtue of being admissible | - |
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| admit | (verb) declare to be true or admit the existence or reality or truth of | Synonyms: acknowledge |
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| (verb) admit into a group or community | Synonyms: accept, take, take on |
| (verb) allow participation in or the right to be part of; permit to exercise the rights, functions, and responsibilities of | Synonyms: include, let in |
| (verb) allow to enter; grant entry to | Synonyms: allow in, intromit, let in |
| (verb) give access or entrance to | - |
| (verb) serve as a means of entrance | - |
| (verb) have room for; hold without crowding | Synonyms: accommodate, hold |
| (verb) afford possibility | Synonyms: allow |
| admittable | (adjective) deserving to be allowed to enter | Synonyms: admittible |
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| admittance | (noun) the act of admitting someone to enter | Synonyms: admission |
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| (noun) the right to enter | Synonyms: access, accession, admission, entree |
| admittedly | (adverb) as acknowledged | Synonyms: avowedly, confessedly, true |
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| admittible | (adjective) deserving to be allowed to enter | Synonyms: admittable |
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| admonition | (noun) a firm rebuke | Synonyms: admonishment, monition |
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| (noun) cautionary advice about something imminent (especially imminent danger or other unpleasantness) | Synonyms: monition, warning, word of advice |
| admonitory | (adjective) serving to warn | Synonyms: cautionary, exemplary, monitory, warning |
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| (adjective) expressing reproof or reproach especially as a corrective | Synonyms: admonishing, reproachful, reproving |
| adorability | (noun) extreme attractiveness | Synonyms: adorableness |
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| adroit | (adjective) quick or skillful or adept in action or thought | - |
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| adroitly | (adverb) with adroitness; in an adroit manner | - |
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| adroitness | (noun) skillful performance or ability without difficulty | Synonyms: adeptness, deftness, facility, quickness |
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| adscititious | (adjective) added or derived from something outside; not inherent | - |
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| (adjective) supplemental; not part of the real or essential nature of a thing | - |
| adventitia | (noun) an enveloping or covering membrane or layer of body tissue | Synonyms: tunic, tunica |
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| adventitial | (adjective) of or pertaining to the adventitia | - |
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| adventitious | (adjective) associated by chance and not an integral part | - |
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| adversity | (noun) a stroke of ill fortune; a calamitous event | - |
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| (noun) a state of misfortune or affliction | Synonyms: hard knocks, hardship |
| advisability | (noun) the quality of being advisable | - |
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| aerolite | (noun) a stony meteorite consisting of silicate minerals | - |
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| aerolitic | (adjective) of or pertaining to certain stony meteorites | - |
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| affability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affableness, amiability, amiableness, bonhomie, geniality |
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| 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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| affinity | (noun) inherent resemblance between persons or things | - |
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| (noun) a natural attraction or feeling of kinship | - |
| (noun) the force attracting atoms to each other and binding them together in a molecule | Synonyms: chemical attraction |
| (noun) (immunology) the attraction between an antigen and an antibody | - |
| (noun) (anthropology) kinship by marriage or adoption; not a blood relationship | - |
| (noun) (biology) state of relationship between organisms or groups of organisms resulting in resemblance in structure or structural parts | Synonyms: phylogenetic relation |
| (noun) a close connection marked by community of interests or similarity in nature or character | Synonyms: kinship |
| agility | (noun) the gracefulness of a person or animal that is quick and nimble | Synonyms: legerity, lightness, lightsomeness, nimbleness |
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| agitate | (verb) change the arrangement or position of | Synonyms: commove, disturb, raise up, shake up, stir up, vex |
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| (verb) cause to be agitated, excited, or roused | Synonyms: charge, charge up, commove, excite, rouse, turn on |
| (verb) move very slightly | Synonyms: budge, shift, stir |
| (verb) move or cause to move back and forth | Synonyms: shake |
| (verb) try to stir up public opinion | Synonyms: foment, stir up |
| (verb) exert oneself continuously, vigorously, or obtrusively to gain an end or engage in a crusade for a certain cause or person; be an advocate for | Synonyms: campaign, crusade, fight, press, push |
| agitated | (adjective) troubled emotionally and usually deeply | - |
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| (adjective) physically disturbed or set in motion | - |
| agitating | (adjective) causing or tending to cause anger or resentment | Synonyms: agitative, provoking |
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| agitation | (noun) disturbance usually in protest | Synonyms: excitement, hullabaloo, turmoil, upheaval |
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| (noun) the act of agitating something; causing it to move around (usually vigorously) | - |
| (noun) the feeling of being agitated; not calm | - |
| (noun) a state of agitation or turbulent change or development | Synonyms: ferment, fermentation, tempestuousness, unrest |
| (noun) a mental state of extreme emotional disturbance | - |
| agitative | (adjective) causing or tending to cause anger or resentment | Synonyms: agitating, provoking |
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| agitator | (noun) one who agitates; a political troublemaker | Synonyms: fomenter |
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| agitprop | (noun) political propaganda (especially communist propaganda) communicated via art and literature and cinema | - |
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| aglitter | (adjective) having brief brilliant points or flashes of light | Synonyms: coruscant, fulgid, glinting, glistering, glittering, glittery, scintillant, scintillating, sparkly |
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| agreeability | (noun) a temperamental disposition to be agreeable | Synonyms: agreeableness |
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| aitchbone | (noun) a cut of beef including the H-shaped rump bone | - |
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| akvavit | (noun) Scandinavian liquor usually flavored with caraway seeds | Synonyms: aquavit |
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| alacritous | (adjective) quick and eager | - |
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| alacrity | (noun) liveliness and eagerness | Synonyms: briskness, smartness |
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| albite | (noun) a widely distributed feldspar that forms rocks | Synonyms: white feldspar |
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| albitic | (adjective) of or related to albite feldspar | - |
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| alexandrite | (noun) a green variety of chrysoberyl used as a gemstone | - |
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| algidity | (noun) prostration characterized by cold and clammy skin and low blood pressure | - |
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| algorithm | (noun) a precise rule (or set of rules) specifying how to solve some problem | Synonyms: algorithmic program, algorithmic rule |
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| algorithmic | (adjective) of or relating to or having the characteristics of an algorithm | - |
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| aliterate | (noun) a person who can read but is disinclined to derive information from literary sources | Synonyms: aliterate person |
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| alkalinity | (noun) pH values above 7 | - |
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| alliterate | (verb) use alliteration as a form of poetry | - |
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| alliteration | (noun) use of the same consonant at the beginning of each stressed syllable in a line of verse | Synonyms: beginning rhyme, head rhyme, initial rhyme |
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| alliterative | (adjective) having the same consonant at the beginning of each stressed syllable | - |
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| alliteratively | (adverb) in an alliterative manner | - |
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