| abatable | (adjective) capable of being abated | - |
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| abdicable | (adjective) capable of being discarded or renounced or relinquished | - |
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| abele | (noun) a poplar that is widely cultivated in the United States; has white bark and leaves with whitish undersurfaces | Synonyms: aspen poplar, Populus alba, silver-leaved poplar, white aspen, white poplar |
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| able | (adjective) (usually followed by `to') having the necessary means or skill or know-how or authority to do something | - |
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| (adjective) having inherent physical or mental ability or capacity | - |
| (adjective) have the skills and qualifications to do things well | Synonyms: capable |
| (adjective) having a strong healthy body | Synonyms: able-bodied |
| ableism | (noun) discrimination in favor of the able-bodied | Synonyms: able-bodiedism, able-bodism, ablism |
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| ablepharia | (noun) a congenital absence of eyelids (partial or complete) | - |
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| abolishable | (adjective) capable of being abolished | - |
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| abominable | (adjective) exceptionally bad or displeasing | Synonyms: atrocious, awful, dreadful, painful, terrible, unspeakable |
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| (adjective) unequivocally detestable | Synonyms: detestable, execrable, odious |
| abseiler | (noun) a person who descends down a nearly vertical face by using a doubled rope that is wrapped around the body and attached to some high point | Synonyms: rappeller |
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| absorbable | (adjective) capable of being absorbed or taken in through the pores of a surface | - |
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| acatalectic | (adjective) (verse) metrically complete; especially having the full number of syllables in the final metrical foot | - |
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| (noun) (prosody) a line of verse that has the full number of syllables | - |
| acaulescent | (adjective) (of plants) having no apparent stem above ground | Synonyms: stemless |
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| accelerando | (adjective) (music) gradually increasing in tempo | - |
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| (noun) a gradually increasing tempo of music | - |
| (adverb) with increasing speed | - |
| accelerate | (verb) move faster | Synonyms: quicken, speed, speed up |
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| (verb) cause to move faster | Synonyms: speed, speed up |
| accelerated | (adjective) speeded up, as of an academic course | - |
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| acceleration | (noun) the act of accelerating; increasing the speed | Synonyms: quickening, speedup |
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| (noun) an increase in rate of change | - |
| (noun) (physics) a rate of increase of velocity | - |
| accelerative | (adjective) tending to increase velocity | Synonyms: acceleratory |
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| accelerator | (noun) a valve that regulates the supply of fuel to the engine | Synonyms: throttle, throttle valve |
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| (noun) a scientific instrument that increases the kinetic energy of charged particles | Synonyms: atom smasher, particle accelerator |
| (noun) a pedal that controls the throttle valve | Synonyms: accelerator pedal, gas, gas pedal, gun, throttle |
| (noun) (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected | Synonyms: catalyst |
| acceleratory | (adjective) tending to increase velocity | Synonyms: accelerative |
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| accelerometer | (noun) an instrument for measuring the acceleration of aircraft or rockets | - |
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| acceptable | (adjective) worthy of acceptance or satisfactory | - |
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| (adjective) adequate for the purpose | - |
| (adjective) meeting requirements | Synonyms: decent, satisfactory |
| (adjective) judged to be in conformity with approved usage | - |
| acceptableness | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptability |
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| accessible | (adjective) capable of being reached | - |
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| (adjective) easy to get along with or talk to; friendly | - |
| (adjective) easily obtained | - |
| (adjective) capable of being read with comprehension | Synonyms: approachable |
| accomplishable | (adjective) capable of existing or taking place or proving true; possible to do | Synonyms: achievable, doable, manageable, realizable |
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| accountable | (adjective) liable to account for one's actions | Synonyms: answerable |
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| acetylene | (noun) a colorless flammable gas used chiefly in welding and in organic synthesis | Synonyms: alkyne, ethyne |
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| acetylenic | (adjective) of or related to acetylene | - |
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| achievable | (adjective) capable of existing or taking place or proving true; possible to do | Synonyms: accomplishable, doable, manageable, realizable |
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| achillea | (noun) any of several plants of the genus Achillea native to Europe and having small white flowers in flat-topped flower heads | - |
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| acidophile | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophil |
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| acidulent | (adjective) being sour to the taste | Synonyms: acid, acidic, acidulous |
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| acknowledge | (verb) accept as legally binding and valid | - |
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| (verb) accept (someone) to be what is claimed or accept his power and authority | Synonyms: know, recognise, recognize |
| (verb) declare to be true or admit the existence or reality or truth of | Synonyms: admit |
| (verb) express obligation, thanks, or gratitude for | Synonyms: recognise, recognize |
| (verb) report the receipt of | Synonyms: receipt |
| (verb) express recognition of the presence or existence of, or acquaintance with | Synonyms: notice |
| acknowledgeable | (adjective) capable of being acknowledged | - |
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| acknowledged | (adjective) recognized or made known or admitted | - |
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| (adjective) generally accepted | - |
| acknowledgement | (noun) a statement acknowledging something or someone | Synonyms: acknowledgment |
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| (noun) the state or quality of being recognized or acknowledged | Synonyms: acknowledgment, recognition |
| acknowledgment | (noun) a statement acknowledging something or someone | Synonyms: acknowledgement |
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| (noun) a short note recognizing a source of information or of a quoted passage | Synonyms: citation, cite, credit, mention, quotation, reference |
| (noun) the state or quality of being recognized or acknowledged | Synonyms: acknowledgement, recognition |
| acquirable | (adjective) capable of being acquired | - |
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| acrolein | (noun) a pungent colorless unsaturated liquid aldehyde made from propene | Synonyms: propenal |
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| acrylonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: propenonitrile, vinyl cyanide |
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| actable | (adjective) capable of being acted; suitable for the stage | - |
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| actionable | (adjective) affording grounds for legal action | - |
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| aculea | (noun) small spiny outgrowth on the wings of certain insects | - |
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| aculeate | (adjective) having or resembling a stinger or barb | Synonyms: aculeated |
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| aculeated | (adjective) having or resembling a stinger or barb | Synonyms: aculeate |
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| aculeus | (noun) a sharp-pointed process especially a sting of a hymenopterous insect | - |
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| (noun) a stiff sharp-pointed plant process | - |
| adaptable | (adjective) capable of adapting (of becoming or being made suitable) to a particular situation or use | - |
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| addable | (adjective) capable of being added or added to | Synonyms: addible |
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| addible | (adjective) capable of being added or added to | Synonyms: addable |
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| addle | (verb) become rotten | - |
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| (verb) mix up or confuse | Synonyms: muddle, puddle |
| addlebrained | (adjective) stupid and confused | Synonyms: addlepated, muddleheaded, puddingheaded |
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| addled | (adjective) confused and vague; used especially of thinking | Synonyms: befuddled, muddled, muzzy, woolly-headed, woolly, wooly-minded, wooly |
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| (adjective) (of eggs) no longer edible | - |
| addlehead | (noun) a person with confused ideas; incapable of serious thought | Synonyms: addle-head, birdbrain, loon |
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| addlepated | (adjective) stupid and confused | Synonyms: addlebrained, muddleheaded, puddingheaded |
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| addressable | (adjective) capable of being addressed | - |
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| adjustable | (adjective) capable of being changed so as to match or fit | - |
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| (adjective) capable of being regulated | - |
| administrable | (adjective) capable of being administered or managed | - |
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| admirable | (adjective) inspiring admiration or approval | - |
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| (adjective) deserving of esteem and respect | Synonyms: estimable, good, honorable, respectable |
| admirableness | (noun) admirable excellence | Synonyms: admirability, wonderfulness |
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| admissible | (adjective) deserving to be admitted | - |
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| admittable | (adjective) deserving to be allowed to enter | Synonyms: admittible |
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| admittible | (adjective) deserving to be allowed to enter | Synonyms: admittable |
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| adolesce | (verb) become adolescent; pass through adolescence | - |
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| adolescence | (noun) in the state that someone is in between puberty and adulthood | - |
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| (noun) the time period between the beginning of puberty and adulthood | - |
| adolescent | (adjective) relating to or peculiar to or suggestive of an adolescent | - |
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| (adjective) in the state of development between puberty and maturity | - |
| (adjective) displaying or suggesting a lack of maturity | Synonyms: jejune, juvenile, puerile |
| (adjective) being of the age 13 through 19 | Synonyms: teen, teenage, teenaged |
| (noun) a juvenile between the onset of puberty and maturity | Synonyms: stripling, teen, teenager |
| adoptable | (adjective) suitable or eligible for adoption | - |
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| adorable | (adjective) lovable especially in a childlike or naive way | Synonyms: endearing, lovely |
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| adorableness | (noun) extreme attractiveness | Synonyms: adorability |
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| adrenalectomy | (noun) surgical removal of one or both adrenal glands | Synonyms: suprarenalectomy |
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| adsorbable | (adjective) capable of being adsorbed or accumulated on a surface of a solid | Synonyms: adsorbate |
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| advisable | (adjective) worthy of being recommended or suggested; prudent or wise | - |
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| aerophile | (noun) a lover of aviation | - |
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| afebrile | (adjective) having no fever | - |
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| affable | (adjective) diffusing warmth and friendliness | Synonyms: amiable, cordial, genial |
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| affableness | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, amiability, amiableness, bonhomie, geniality |
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| affirmable | (adjective) capable of being affirmed or asserted | Synonyms: assertable |
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| affordable | (adjective) that you have the financial means for | Synonyms: low-cost, low-priced |
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| ageless | (adjective) continuing forever or indefinitely | Synonyms: aeonian, eonian, eternal, everlasting, perpetual, unceasing, unending |
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| agelessness | (noun) the quality of being timeless and eternal | - |
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| agile | (adjective) moving quickly and lightly | Synonyms: nimble, quick, spry |
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| (adjective) mentally quick | Synonyms: nimble |
| agilely | (adverb) in a nimble or agile manner; with quickness and lightness and ease | Synonyms: nimbly |
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| agleam | (adjective) bright with a steady but subdued shining | Synonyms: gleaming, nitid |
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| aglet | (noun) ornamental tagged cord or braid on the shoulder of a uniform | Synonyms: aiglet, aiguillette |
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| (noun) metal or plastic sheath over the end of a shoelace or ribbon | Synonyms: aiglet |
| agreeable | (adjective) conforming to your own liking or feelings or nature | - |
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| (adjective) prepared to agree or consent | - |
| (adjective) in keeping | Synonyms: accordant, concordant, conformable, consonant |
| agreeableness | (noun) a temperamental disposition to be agreeable | Synonyms: agreeability |
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| (noun) pleasantness resulting from agreeable conditions | Synonyms: amenity |
| aiglet | (noun) ornamental tagged cord or braid on the shoulder of a uniform | Synonyms: aglet, aiguillette |
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| (noun) metal or plastic sheath over the end of a shoelace or ribbon | Synonyms: aglet |
| aiguillette | (noun) ornamental tagged cord or braid on the shoulder of a uniform | Synonyms: aglet, aiglet |
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| aileron | (noun) an airfoil that controls lateral motion | - |
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| aimless | (adjective) aimlessly drifting | Synonyms: adrift, afloat, directionless, planless, rudderless, undirected |
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| (adjective) continually changing especially as from one abode or occupation to another | Synonyms: drifting, floating, vagabond, vagrant |
| aimlessly | (adverb) without aim; in an aimless manner | - |
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| aimlessness | (noun) the quality of lacking any definite purpose | Synonyms: purposelessness |
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| airless | (adjective) lacking fresh air | Synonyms: close, stuffy, unaired |
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| airmailer | (noun) a mailer for airmail | - |
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| aisle | (noun) passageway between seating areas as in an auditorium or passenger vehicle or between areas of shelves of goods as in stores | Synonyms: gangway |
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| (noun) part of a church divided laterally from the nave proper by rows of pillars or columns | - |
| (noun) a long narrow passage (as in a cave or woods) | - |
| alcalescent | (adjective) tending to become alkaline; slightly alkaline | Synonyms: alkalescent |
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| ale | (noun) a general name for beer made with a top fermenting yeast; in some of the United States an ale is (by law) a brew of more than 4% alcohol by volume | - |
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| aleatory | (adjective) dependent on chance | - |
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| alecost | (noun) tansy-scented Eurasian perennial herb with buttonlike yellow flowers; used as potherb or salad green and sometimes for potpourri or tea or flavoring; sometimes placed in genus Chrysanthemum | Synonyms: balsam herb, bible leaf, Chrysanthemum balsamita, costmary, mint geranium, Tanacetum balsamita |
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| alee | (adverb) on or toward the lee | - |
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| alehoof | (noun) trailing European aromatic plant of the mint family having rounded leaves and small purplish flowers often grown in hanging baskets; naturalized in North America; sometimes placed in genus Nepeta | Synonyms: field balm, gill-over-the-ground, Glechoma hederaceae, ground ivy, Nepeta hederaceae, runaway robin |
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| alehouse | (noun) a tavern where ale is sold | - |
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