| achromatous | (adjective) having little or inadequate color | - |
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| aciculate | (adjective) related to plants or animals or crystals having aciculae or needlelike parts | - |
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| acidification | (noun) the process of becoming acid or being converted into an acid | - |
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| acidulate | (verb) make sour or more sour | Synonyms: acetify, acidify, sour |
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| acrobat | (noun) an athlete who performs acts requiring skill and agility and coordination | - |
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| acrobatic | (adjective) vigorously active | Synonyms: athletic, gymnastic |
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| acrobatics | (noun) the gymnastic moves of an acrobat | Synonyms: tumbling |
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| (noun) the performance of stunts while in flight in an aircraft | Synonyms: aerobatics, stunt flying, stunting |
| acrylate | (noun) a salt or ester of propenoic acid | Synonyms: propenoate |
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| activate | (verb) make active or more active | - |
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| (verb) make (substances) radioactive | - |
| (verb) aerate (sewage) so as to favor the growth of organisms that decompose organic matter | Synonyms: aerate |
| (verb) make more adsorptive | - |
| (verb) put in motion or move to act | Synonyms: actuate, set off, spark, spark off, touch off, trigger, trigger off, trip |
| activated | (adjective) rendered active; e.g. rendered radioactive or luminescent or photosensitive or conductive | - |
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| (adjective) (military) set up and placed on active assignment | - |
| (adjective) (of e.g. a molecule) made reactive or more reactive | Synonyms: excited |
| (adjective) (of sewage) treated with aeration and bacteria to aid decomposition | - |
| activating | (adjective) causing motion or action or change | Synonyms: actuating |
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| (noun) the activity of causing to have energy and be active | Synonyms: activation, energizing |
| activation | (noun) the activity of causing to have energy and be active | Synonyms: activating, energizing |
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| (noun) making active and effective (as a bomb) | - |
| (noun) stimulation of activity in an organism or chemical | - |
| activator | (noun) (biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription | - |
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| actualisation | (noun) making real or giving the appearance of reality | Synonyms: actualization, realisation, realization |
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| actualization | (noun) making real or giving the appearance of reality | Synonyms: actualisation, realisation, realization |
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| actuate | (verb) put in motion or move to act | Synonyms: activate, set off, spark, spark off, touch off, trigger, trigger off, trip |
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| (verb) give an incentive for action | Synonyms: incite, motivate, move, prompt, propel |
| actuated | (adjective) moved to action | - |
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| actuating | (adjective) causing motion or action or change | Synonyms: activating |
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| actuation | (noun) the act of propelling | Synonyms: propulsion |
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| actuator | (noun) a mechanism that puts something into automatic action | - |
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| acuate | (adjective) ending in a sharp point | Synonyms: acute, needlelike, sharp |
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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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| acuminate | (adjective) (of a leaf shape) narrowing to a slender point | - |
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| (verb) make sharp or acute; taper; make (something) come to a point | - |
| acylation | (noun) the process of introducing an acyl group into a compound | - |
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| adaptation | (noun) (physiology) the responsive adjustment of a sense organ (as the eye) to varying conditions (as of light) | - |
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| (noun) a written work (as a novel) that has been recast in a new form | Synonyms: version |
| (noun) the process of adapting to something (such as environmental conditions) | Synonyms: adaption, adjustment |
| adaptational | (adjective) of or relating to adaptation | - |
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| adaptative | (adjective) having a capacity for adaptation | Synonyms: adaptive |
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| addlepated | (adjective) stupid and confused | Synonyms: addlebrained, muddleheaded, puddingheaded |
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| adenocarcinomatous | (adjective) of or pertaining to adenocarcinoma | - |
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| adenopathy | (noun) a glandular disease or enlargement of glandular tissue (especially of the lymph glands) | - |
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| adequate | (adjective) having the requisite qualities or resources to meet a task | Synonyms: equal |
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| (adjective) about average; acceptable | Synonyms: fair to middling, passable, tolerable |
| (adjective) sufficient for the purpose | Synonyms: enough |
| adequately | (adverb) in an adequate manner or to an adequate degree | - |
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| adequateness | (noun) the quality of being able to meet a need satisfactorily: | Synonyms: adequacy |
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| adiabatic | (adjective) occurring without loss or gain of heat | - |
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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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| adjudicate | (verb) bring to an end; settle conclusively | Synonyms: decide, resolve, settle |
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| (verb) put on trial or hear a case and sit as the judge at the trial of | Synonyms: judge, try |
| adjudication | (noun) the final judgment in a legal proceeding; the act of pronouncing judgment based on the evidence presented | - |
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| adjudicative | (adjective) concerned with adjudicating | Synonyms: adjudicatory |
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| adjudicator | (noun) a person who studies and settles conflicts and disputes | - |
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| adjudicatory | (adjective) concerned with adjudicating | Synonyms: adjudicative |
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| adjuration | (noun) a solemn and earnest appeal to someone to do something | - |
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| adjuratory | (adjective) earnestly or solemnly entreating | - |
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| (adjective) containing a solemn charge or command | - |
| administrate | (verb) work in an administrative capacity; supervise or be in charge of | Synonyms: administer |
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| administration | (noun) a method of tending to or managing the affairs of some group of people (especially the group's business affairs) | Synonyms: disposal |
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| (noun) the act of administering medication | Synonyms: giving medication |
| (noun) the act of meting out justice according to the law | Synonyms: judicature |
| (noun) the act of governing; exercising authority | Synonyms: governance, governing, government, government activity |
| (noun) the persons (or committees or departments etc.) who make up a body for the purpose of administering something | Synonyms: brass, establishment, governance, governing body, organisation, organization |
| (noun) the tenure of a president | Synonyms: presidency, presidential term |
| administrative | (adjective) of or relating to or responsible for administration | - |
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| administratively | (adverb) by or for an administrator | - |
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| administrator | (noun) someone who administers a business | Synonyms: decision maker |
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| (noun) the party appointed by a probate court to distribute the estate of someone who dies without a will or without naming an executor | - |
| (noun) someone who manages a government agency or department | Synonyms: executive |
| admiration | (noun) a favorable judgment | Synonyms: appreciation |
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| (noun) a feeling of delighted approval and liking | Synonyms: esteem |
| (noun) the feeling aroused by something strange and surprising | Synonyms: wonder, wonderment |
| adnate | (adjective) of unlike parts or organs; growing closely attached | - |
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| adoration | (noun) the act of admiring strongly | Synonyms: idolisation, idolization |
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| (noun) the worship given to God alone | Synonyms: latria |
| (noun) a feeling of profound love and admiration | Synonyms: worship |
| adsorbate | (adjective) capable of being adsorbed or accumulated on a surface of a solid | Synonyms: adsorbable |
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| (noun) a material that has been or is capable of being adsorbed | - |
| adulate | (verb) flatter in an obsequious manner | - |
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| adulation | (noun) servile flattery; exaggerated and hypocritical praise | - |
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| adulator | (noun) a person who uses flattery | Synonyms: flatterer |
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| adulatory | (adjective) obsequiously complimentary | Synonyms: flattering |
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| adulterate | (adjective) mixed with impurities | Synonyms: adulterated, debased |
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| (verb) corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones | Synonyms: debase, dilute, load, stretch |
| adulterated | (adjective) mixed with impurities | Synonyms: adulterate, debased |
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| adulterating | (adjective) making impure or corrupt by adding extraneous materials | Synonyms: adulterant |
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| adulteration | (noun) the act of adulterating (especially the illicit substitution of one substance for another) | - |
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| (noun) being mixed with extraneous material; the product of adulterating | Synonyms: debasement |
| adulterator | (noun) a changer who lessens the purity or effectiveness of a substance | - |
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| (noun) any substance that lessens the purity or effectiveness of a substance | Synonyms: adulterant |
| adumbrate | (verb) describe roughly or briefly or give the main points or summary of | Synonyms: outline, sketch |
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| (verb) give to understand | Synonyms: insinuate, intimate |
| adumbration | (noun) a sketchy or imperfect or faint representation | - |
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| (noun) the act of providing vague advance indications; representing beforehand | Synonyms: foreshadowing, prefiguration |
| adumbrative | (adjective) indistinctly prophetic | Synonyms: foreshadowing, prefigurative |
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| adversative | (adjective) expressing antithesis or opposition | Synonyms: oppositive |
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| advocate | (noun) a person who pleads for a cause or propounds an idea | Synonyms: advocator, exponent, proponent |
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| (noun) a lawyer who pleads cases in court | Synonyms: counsel, counsellor, counselor-at-law, counselor, pleader |
| (verb) push for something | Synonyms: recommend, urge |
| (verb) speak, plead, or argue in favor of | Synonyms: preach |
| advocator | (noun) a person who pleads for a cause or propounds an idea | Synonyms: advocate, exponent, proponent |
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| aerate | (verb) aerate (sewage) so as to favor the growth of organisms that decompose organic matter | Synonyms: activate |
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| (verb) impregnate, combine, or supply with oxygen | Synonyms: oxygenate, oxygenise, oxygenize |
| (verb) expose to fresh air | Synonyms: air, air out |
| aerated | (adjective) supplied with carbon dioxide | Synonyms: charged |
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| (adjective) (of a liquid) treated by having air passed or bubbled through it for purification | - |
| aeration | (noun) the act of charging a liquid with a gas making it effervescent | - |
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| (noun) the process of exposing to air (so as to purify) | - |
| aerator | (noun) an apparatus for exposing something to the air (as sewage) | - |
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| aerobatics | (noun) the performance of stunts while in flight in an aircraft | Synonyms: acrobatics, stunt flying, stunting |
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| aerogenerator | (noun) generator that extracts usable energy from winds | Synonyms: wind generator, windmill |
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| aerophilatelic | (adjective) of or relating to airmail stamps | - |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| aestivate | (verb) sleep during summer | Synonyms: estivate |
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| aestivation | (noun) (botany) the arrangement of sepals and petals in a flower bud before it opens | Synonyms: estivation |
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| (noun) (zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period | Synonyms: estivation |
| affectation | (noun) a deliberate pretense or exaggerated display | Synonyms: affectedness, mannerism, pose |
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| affectionate | (adjective) having or displaying warmth or affection | Synonyms: fond, lovesome, tender |
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| affectionately | (adverb) with affection | Synonyms: dear, dearly |
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| affectionateness | (noun) a quality proceeding from feelings of affection or love | Synonyms: fondness, lovingness, warmth |
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| (noun) a positive feeling of liking | Synonyms: affection, fondness, heart, philia, tenderness, warmheartedness, warmness |
| affiliate | (noun) a subsidiary or subordinate organization that is affiliated with another organization | - |
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| (noun) a subordinate or subsidiary associate; a person who is affiliated with another or with an organization | - |
| (verb) join in an affiliation | - |
| (verb) keep company with; hang out with | Synonyms: associate, assort, consort |
| affiliated | (adjective) being joined in close association | Synonyms: attached, connected |
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| affiliation | (noun) the act of becoming formally connected or joined | - |
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| (noun) a social or business relationship | Synonyms: association, tie-up, tie |
| affirmation | (noun) a judgment by a higher court that the judgment of a lower court was correct and should stand | - |
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| (noun) a statement asserting the existence or the truth of something | Synonyms: avouchment, avowal |
| (noun) (religion) a solemn declaration that serves the same purpose as an oath (if an oath is objectionable to the person on religious or ethical grounds) | - |
| (noun) the act of affirming or asserting or stating something | Synonyms: assertion, statement |
| affirmative | (adjective) affirming or giving assent | Synonyms: affirmatory |
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| (adjective) expressing or manifesting praise or approval | Synonyms: approbative, approbatory, approving, plausive |
| (adjective) expecting the best | Synonyms: optimistic |
| (noun) a reply of affirmation | - |
| affirmatively | (adverb) in an affirmative manner | - |
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| affirmativeness | (noun) the agreeable quality of one who assents | - |
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| affirmatory | (adjective) affirming or giving assent | Synonyms: affirmative |
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| affixation | (noun) formation of a word by means of an affix | - |
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| (noun) the act of attaching or affixing something | Synonyms: attachment |
| (noun) the result of adding an affix to a root word | - |
| afflatus | (noun) a strong creative impulse; divine inspiration | - |
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| afforestation | (noun) the conversion of bare or cultivated land into forest (originally for the purpose of hunting) | - |
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| affricate | (noun) a composite speech sound consisting of a stop and a fricative articulated at the same point (as `ch' in `chair' and `j' in `joy') | Synonyms: affricate consonant, affricative |
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| affrication | (noun) the conversion of a simple stop consonant into an affricate | - |
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| affricative | (noun) a composite speech sound consisting of a stop and a fricative articulated at the same point (as `ch' in `chair' and `j' in `joy') | Synonyms: affricate, affricate consonant |
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| aflatoxin | (noun) a potent carcinogen from the fungus Aspergillus; can be produced and stored for use as a bioweapon | - |
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| afloat | (adjective) borne on the water; floating | - |
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| (adjective) covered with water | Synonyms: awash, flooded, inundated, overflowing |
| (adjective) aimlessly drifting | Synonyms: adrift, aimless, directionless, planless, rudderless, undirected |
| aftermath | (noun) the outcome of an event especially as relative to an individual | Synonyms: consequence |
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| (noun) the consequences of an event (especially a catastrophic event) | Synonyms: backwash, wake |
| aftersensation | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: afterimage |
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| agate | (noun) an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles | - |
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