| aardvark | (noun) nocturnal burrowing mammal of the grasslands of Africa that feeds on termites; sole extant representative of the order Tubulidentata | Synonyms: ant bear, anteater, Orycteropus afer |
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| 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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| ablative | (noun) the case indicating the agent in passive sentences or the instrument or manner or place of the action described by the verb | Synonyms: ablative case |
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| above | (noun) an earlier section of a written text | - |
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| abrasive | (noun) a substance that abrades or wears down | Synonyms: abradant, abrasive material |
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| abrasiveness | (noun) the roughness of a substance that causes abrasions | Synonyms: harshness, scratchiness |
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| (noun) the quality of being sharply disagreeable | - |
| absolver | (noun) someone who grants absolution | - |
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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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| abvolt | (noun) a unit of potential equal to one-hundred-millionth of a volt | - |
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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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| accusative | (noun) the case of nouns serving as the direct object of a verb | Synonyms: accusative case, objective case |
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| acervulus | (noun) small asexual fruiting body resembling a cushion or blister consisting of a mat of hyphae that is produced on a host by some fungi | - |
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| achievability | (noun) the state of being achievable | Synonyms: attainability, attainableness |
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| achievement | (noun) the action of accomplishing something | Synonyms: accomplishment |
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| achiever | (noun) a person with a record of successes | Synonyms: succeeder, success, winner |
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| acquisitiveness | (noun) strong desire to acquire and possess | - |
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| activating | (noun) the activity of causing to have energy and be active | Synonyms: activation, energizing |
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| 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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| active | (noun) a person who is a participating member of an organization | - |
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| (noun) the voice used to indicate that the grammatical subject of the verb is performing the action or causing the happening denoted by the verb | Synonyms: active voice |
| (noun) chemical agent capable of activity | Synonyms: active agent |
| activeness | (noun) the trait of being active; moving or acting rapidly and energetically | Synonyms: activity |
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| (noun) the state of being active | Synonyms: action, activity |
| activewear | (noun) attire worn for sport or for casual wear | Synonyms: athletic wear, sportswear |
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| activism | (noun) a policy of taking direct action to achieve a political or social goal | - |
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| activist | (noun) a militant reformer | Synonyms: militant |
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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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| additive | (noun) something added to enhance food or gasoline or paint or medicine | - |
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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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| adhesive | (noun) a substance that unites or bonds surfaces together | Synonyms: adhesive agent, adhesive material |
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| adhesiveness | (noun) the property of sticking together (as of glue and wood) or the joining of surfaces of different composition | Synonyms: adherence, adhesion, bond |
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| adjective | (noun) a word that expresses an attribute of something | - |
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| (noun) the word class that qualifies nouns | - |
| adjuvant | (noun) an additive that enhances the effectiveness of medical treatment | - |
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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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| advance | (noun) the act of moving forward (as toward a goal) | Synonyms: advancement, forward motion, onward motion, procession, progress, progression |
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| (noun) increase in price or value | Synonyms: rise |
| (noun) a tentative suggestion designed to elicit the reactions of others | Synonyms: approach, feeler, overture |
| (noun) a movement forward | Synonyms: progress, progression |
| (noun) a change for the better; progress in development | Synonyms: betterment, improvement |
| (noun) an amount paid before it is earned | Synonyms: cash advance |
| advancement | (noun) the act of moving forward (as toward a goal) | Synonyms: advance, forward motion, onward motion, procession, progress, progression |
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| (noun) gradual improvement or growth or development | Synonyms: progress |
| (noun) encouragement of the progress or growth or acceptance of something | Synonyms: furtherance, promotion |
| advancer | (noun) someone who advances | - |
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| advantage | (noun) the quality of having a superior or more favorable position | Synonyms: vantage |
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| (noun) benefit resulting from some event or action | Synonyms: reward |
| (noun) (tennis) first point scored after deuce | - |
| advantageousness | (noun) the quality of being encouraging or promising of a successful outcome | Synonyms: favorableness, favourableness, positiveness, positivity, profitableness |
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| advection | (noun) (meteorology) the horizontal transfer of heat or other atmospheric properties | - |
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| advent | (noun) arrival that has been awaited (especially of something momentous) | Synonyms: coming |
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| adventitia | (noun) an enveloping or covering membrane or layer of body tissue | Synonyms: tunic, tunica |
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| adventure | (noun) a wild and exciting undertaking (not necessarily lawful) | Synonyms: dangerous undertaking, escapade, risky venture |
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| adventurer | (noun) a person who enjoys taking risks | Synonyms: venturer |
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| (noun) someone who travels into little known regions (especially for some scientific purpose) | Synonyms: explorer |
| adventuress | (noun) a woman adventurer | - |
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| adventurism | (noun) recklessness in politics or foreign affairs | - |
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| adventurousness | (noun) the trait of being adventurous | Synonyms: venturesomeness |
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| adverb | (noun) a word that modifies something other than a noun | - |
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| (noun) the word class that qualifies verbs or clauses | - |
| adverbial | (noun) a word or group of words function as an adverb | - |
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| adversary | (noun) someone who offers opposition | Synonyms: antagonist, opponent, opposer, resister |
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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 |
| advert | (noun) a public promotion of some product or service | Synonyms: ad, advertisement, advertising, advertizement, advertizing |
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| advertence | (noun) the process of being heedful | Synonyms: advertency |
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| advertency | (noun) the process of being heedful | Synonyms: advertence |
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| advertisement | (noun) a public promotion of some product or service | Synonyms: ad, advert, advertising, advertizement, advertizing |
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| advertiser | (noun) someone whose business is advertising | Synonyms: adman, advertizer |
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| advertising | (noun) the business of drawing public attention to goods and services | Synonyms: merchandising, publicizing |
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| (noun) a public promotion of some product or service | Synonyms: ad, advert, advertisement, advertizement, advertizing |
| advertizement | (noun) a public promotion of some product or service | Synonyms: ad, advert, advertisement, advertising, advertizing |
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| advertizer | (noun) someone whose business is advertising | Synonyms: adman, advertiser |
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| advertizing | (noun) a public promotion of some product or service | Synonyms: ad, advert, advertisement, advertising, advertizement |
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| advertorial | (noun) an advertisement that is written and presented in the style of an editorial or journalistic report | - |
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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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| 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 | (noun) an announcement that usually advises or warns the public of some threat | - |
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| advocacy | (noun) active support of an idea or cause etc.; especially the act of pleading or arguing for something | Synonyms: protagonism |
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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 |
| advocator | (noun) a person who pleads for a cause or propounds an idea | Synonyms: advocate, exponent, proponent |
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| advowson | (noun) the right in English law of presenting a nominee to a vacant ecclesiastical benefice | - |
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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 |
| 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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| affirmative | (noun) a reply of affirmation | - |
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| affirmativeness | (noun) the agreeable quality of one who assents | - |
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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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| afropavo | (noun) both sexes are brightly colored | Synonyms: Afropavo congensis, Congo peafowl |
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| agave | (noun) tropical American plants with basal rosettes of fibrous sword-shaped leaves and flowers in tall spikes; some cultivated for ornament or for fiber | Synonyms: American aloe, century plant |
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| aggravation | (noun) unfriendly behavior that causes anger or resentment | Synonyms: irritation, provocation |
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| (noun) action that makes a problem or a disease (or its symptoms) worse | Synonyms: exacerbation |
| (noun) an exasperated feeling of annoyance | Synonyms: exasperation |
| aggravator | (noun) an unpleasant person who is annoying or exasperating | Synonyms: annoyance |
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| aggressiveness | (noun) the quality of being bold and enterprising | - |
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| (noun) a natural disposition to be hostile | Synonyms: belligerence, pugnacity |
| (noun) a feeling of hostility that arouses thoughts of attack | Synonyms: aggression |
| airwave | (noun) medium for radio and television broadcasting | Synonyms: air |
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| akvavit | (noun) Scandinavian liquor usually flavored with caraway seeds | Synonyms: aquavit |
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| alcove | (noun) a small recess opening off a larger room | Synonyms: bay |
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| aliveness | (noun) the property of being animated; having animal life as distinguished from plant life | Synonyms: animateness, liveness |
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| (noun) the condition of living or the state of being alive | Synonyms: animation, life, living |
| alleviant | (noun) remedy that alleviates pain without curing | Synonyms: alleviator, palliative |
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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 |
| alleviator | (noun) remedy that alleviates pain without curing | Synonyms: alleviant, palliative |
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| (noun) a therapist who makes suffering more endurable | - |
| allusiveness | (noun) a quality characterized by indirect reference | - |
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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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| almsgiver | (noun) a person who gives alms | - |
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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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| alternative | (noun) one of a number of things from which only one can be chosen | Synonyms: choice, option |
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| alveolar | (noun) a consonant articulated with the tip of the tongue near the gum ridge | Synonyms: alveolar consonant, dental, dental consonant |
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| alveolitis | (noun) inflammation of the alveoli in the lungs caused by inhaling dust; with repeated exposure the condition may become chronic | - |
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| (noun) inflammation in the socket of a tooth; sometimes occurs after a tooth is extracted and a blood clot fails to form | Synonyms: dry socket |
| alveolus | (noun) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways | Synonyms: air cell, air sac |
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| (noun) a bony socket in the alveolar ridge that holds a tooth | Synonyms: tooth socket |