| aeronautic | (adjective) of or pertaining to aeronautics | Synonyms: aeronautical |
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| aeronautical | (adjective) of or pertaining to aeronautics | Synonyms: aeronautic |
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| aeronautics | (noun) the theory and practice of navigation through air or space | Synonyms: astronautics |
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| aerophagia | (noun) swallowing air (usually followed by belching and discomfort and flatulence) | - |
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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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| aerophile | (noun) a lover of aviation | - |
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| aerophilic | (adjective) depending on free oxygen or air | Synonyms: aerobic, aerophilous |
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| aerophilous | (adjective) depending on free oxygen or air | Synonyms: aerobic, aerophilic |
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| aerophyte | (noun) plant that derives moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it | Synonyms: air plant, epiphyte, epiphytic plant |
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| aeroplane | (noun) an aircraft that has a fixed wing and is powered by propellers or jets | Synonyms: airplane, plane |
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| aerosol | (noun) a dispenser that holds a substance under pressure and that can release it as a fine spray (usually by means of a propellant gas) | Synonyms: aerosol bomb, aerosol can, aerosol container, spray can |
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| (noun) a cloud of solid or liquid particles in a gas | - |
| aerosolise | (verb) disperse as an aerosol | Synonyms: aerosolize |
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| (verb) become dispersed as an aerosol | Synonyms: aerosolize |
| aerosolised | (adjective) in the form of ultramicroscopic solid or liquid particles dispersed or suspended in air or gas | Synonyms: aerosolized |
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| aerosolize | (verb) disperse as an aerosol | Synonyms: aerosolise |
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| (verb) become dispersed as an aerosol | Synonyms: aerosolise |
| aerosolized | (adjective) in the form of ultramicroscopic solid or liquid particles dispersed or suspended in air or gas | Synonyms: aerosolised |
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| aerospace | (noun) the atmosphere and outer space considered as a whole | - |
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| aery | (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aerial, aeriform, airy, ethereal |
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| (noun) any habitation at a high altitude | Synonyms: aerie, eyrie, eyry |
| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aerie, eyrie, eyry |
| aether | (noun) a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves | Synonyms: ether |
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| afar | (adverb) (old-fashioned) at or from or to a great distance; far | - |
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| afeard | (adjective) a pronunciation of afraid | Synonyms: afeared |
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| afeared | (adjective) a pronunciation of afraid | Synonyms: afeard |
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| afebrile | (adjective) having no fever | - |
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| affair | (noun) a vaguely specified concern | Synonyms: matter, thing |
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| (noun) a formal or official social gathering or ceremony of people | Synonyms: function, occasion, social affair, social function, social gathering, social occasion |
| (noun) a usually secretive or illicit sexual relationship | Synonyms: affaire, amour, intimacy, involvement, liaison |
| affaire | (noun) a usually secretive or illicit sexual relationship | Synonyms: affair, amour, intimacy, involvement, liaison |
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| affairs | (noun) transactions of professional or public interest | - |
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| (noun) matters of personal concern | Synonyms: personal business, personal matters |
| affenpinscher | (noun) European breed of small dog resembling a terrier with dark wiry hair and a tufted muzzle | Synonyms: monkey dog, monkey pinscher |
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| afferent | (adjective) of nerves and nerve impulses; conveying sensory information from the sense organs to the CNS | - |
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| (noun) a nerve that passes impulses from receptors toward or to the central nervous system | Synonyms: afferent nerve, sensory nerve |
| affirm | (verb) establish or strengthen as with new evidence or facts | Synonyms: confirm, corroborate, substantiate, support, sustain |
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| (verb) to declare or affirm solemnly and formally as true | Synonyms: assert, aver, avow, swan, swear, verify |
| (verb) say yes to | - |
| affirmable | (adjective) capable of being affirmed or asserted | Synonyms: assertable |
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| 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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| affirmer | (noun) someone who claims to speak the truth | Synonyms: asserter, asseverator, avower, declarer |
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| afford | (verb) be able to spare or give up | - |
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| (verb) be the cause or source of | Synonyms: give, yield |
| (verb) afford access to | Synonyms: give, open |
| (verb) have the financial means to do something or buy something | - |
| affordable | (adjective) that you have the financial means for | Synonyms: low-cost, low-priced |
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| afforest | (verb) establish a forest on previously unforested land | Synonyms: forest |
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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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| affranchise | (verb) grant freedom to; as from slavery or servitude | Synonyms: enfranchise |
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| affray | (noun) a noisy fight | Synonyms: disturbance, fray, ruffle |
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| (noun) noisy quarrel | Synonyms: altercation, fracas |
| 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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| affright | (noun) an overwhelming feeling of fear and anxiety | Synonyms: panic, terror |
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| (verb) cause fear in | Synonyms: fright, frighten, scare |
| affront | (noun) a deliberately offensive act or something producing the effect of deliberate disrespect | Synonyms: insult |
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| (verb) treat, mention, or speak to rudely | Synonyms: diss, insult |
| afibrinogenemia | (noun) the absence of fibrinogen in the plasma leading to prolonged bleeding | - |
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| afire | (adjective) lighted up by or as by fire or flame | Synonyms: ablaze, aflame, aflare, alight, on fire |
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| aflare | (adjective) lighted up by or as by fire or flame | Synonyms: ablaze, afire, aflame, alight, on fire |
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| (adjective) streaming or flapping or spreading wide as if in a current of air | Synonyms: flaring |
| aflicker | (adjective) shining unsteadily | Synonyms: flickering |
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| aflutter | (adjective) excited in anticipation | Synonyms: nervous |
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| aforementioned | (adjective) being the one previously mentioned or spoken of | Synonyms: aforesaid, said |
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| aforesaid | (adjective) being the one previously mentioned or spoken of | Synonyms: aforementioned, said |
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| aforethought | (adjective) with planning and intention | Synonyms: planned, plotted |
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| afraid | (adjective) filled with fear or apprehension | - |
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| (adjective) filled with regret or concern; used often to soften an unpleasant statement | - |
| (adjective) having feelings of aversion or unwillingness | - |
| (adjective) feeling worry or concern or insecurity | - |
| afresh | (adverb) again but in a new or different way | Synonyms: anew |
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| afropavo | (noun) both sexes are brightly colored | Synonyms: Afropavo congensis, Congo peafowl |
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| after | (adjective) located farther aft | - |
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| (adverb) behind or in the rear | - |
| (adverb) happening at a time subsequent to a reference time | Synonyms: afterward, afterwards, later, later on, subsequently |
| afterbirth | (noun) the placenta and fetal membranes that are expelled from the uterus after the baby is born | - |
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| afterburner | (noun) a device that injects fuel into a hot exhaust for extra thrust | - |
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| aftercare | (noun) care and treatment of a convalescent patient | - |
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| afterdamp | (noun) a toxic mixture of gases (including carbon dioxide and carbon monoxide and nitrogen) after an explosion of firedamp in a mine | - |
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| afterdeck | (noun) a deck abaft of midships | - |
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| aftereffect | (noun) any result that follows its cause after an interval | - |
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| (noun) a delayed effect of a drug or therapy | - |
| afterglow | (noun) the pleasure of remembering some pleasant event | - |
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| (noun) a glow sometimes seen in the sky after sunset | - |
| afterimage | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: aftersensation |
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| afterlife | (noun) life after death | Synonyms: hereafter |
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| 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 |
| aftermost | (adjective) located closest to the stern or tail | - |
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| afternoon | (noun) a conventional expression of greeting or farewell, used to wish someone a good afternoon | Synonyms: good afternoon |
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| (noun) the part of the day between noon and evening | - |
| afterpains | (noun) pains felt by a woman after her baby is born; associated with contractions of the uterus | - |
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| afterpiece | (noun) a brief dramatic piece (usually comic) presented after a play | - |
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| afters | (noun) a dish served as the last course of a meal | Synonyms: dessert, sweet |
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| aftersensation | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: afterimage |
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| aftershaft | (noun) a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds | - |
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| aftershafted | (adjective) having an aftershaft (a small feather at the base of some feathers) | - |
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| aftershock | (noun) a tremor (or one of a series of tremors) occurring after the main shock of an earthquake | - |
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| aftertaste | (noun) an afterimage of a taste | - |
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| afterthought | (noun) an addition that was not included in the original plan | - |
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| (noun) thinking again about a choice previously made | Synonyms: reconsideration, rethink, second thought |
| afterward | (adverb) happening at a time subsequent to a reference time | Synonyms: after, afterwards, later, later on, subsequently |
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| afterwards | (adverb) happening at a time subsequent to a reference time | Synonyms: after, afterward, later, later on, subsequently |
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| afterworld | (noun) the place where you are after you die | - |
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| agar | (noun) a colloidal extract of algae; used especially in culture media and as a gelling agent in foods | Synonyms: agar-agar |
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| (noun) any culture medium that uses agar as the gelling agent | Synonyms: nutrient agar |
| agaric | (noun) a saprophytic fungus of the order Agaricales having an umbrellalike cap with gills on the underside | - |
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| (noun) fungus used in the preparation of punk for fuses | Synonyms: Fomes igniarius |
| agateware | (noun) pottery that is veined and mottled to resemble agate | - |
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| agerasia | (noun) youthful appearance in an old person | - |
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| ageratum | (noun) any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers | - |
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| (noun) rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium | Synonyms: Conoclinium coelestinum, Eupatorium coelestinum, mist-flower, mistflower |
| agglomerate | (adjective) clustered together but not coherent | Synonyms: agglomerated, agglomerative, clustered |
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| (noun) a collection of objects laid on top of each other | Synonyms: cumulation, cumulus, heap, mound, pile |
| (noun) volcanic rock consisting of large fragments fused together | - |
| (verb) form into one cluster | - |
| agglomerated | (adjective) clustered together but not coherent | Synonyms: agglomerate, agglomerative, clustered |
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| agglomeration | (noun) the act of collecting in a mass; the act of agglomerating | - |
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| (noun) a jumbled collection or mass | - |
| agglomerative | (adjective) clustered together but not coherent | Synonyms: agglomerate, agglomerated, clustered |
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| agglomerator | (noun) a device that causes material to gather into rounded balls | - |
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| aggrade | (verb) build up to a level by depositing sediment | - |
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| aggrandise | (verb) add details to | Synonyms: aggrandize, blow up, dramatise, dramatize, embellish, embroider, lard, pad |
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| aggrandisement | (noun) the act of increasing the wealth or prestige or power or scope of something | Synonyms: aggrandizement, elevation |
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| aggrandize | (verb) add details to | Synonyms: aggrandise, blow up, dramatise, dramatize, embellish, embroider, lard, pad |
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| aggrandizement | (noun) the act of increasing the wealth or prestige or power or scope of something | Synonyms: aggrandisement, elevation |
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| aggravate | (verb) make worse | Synonyms: exacerbate, exasperate, worsen |
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| (verb) exasperate or irritate | Synonyms: exacerbate, exasperate |
| aggravated | (adjective) incited, especially deliberately, to anger | Synonyms: provoked |
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| (adjective) made more severe or intense especially in law | - |