| 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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| aerial | (adjective) existing or living or growing or operating in the air | - |
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| (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aeriform, aery, airy, ethereal |
| (noun) a pass to a receiver downfield from the passer | Synonyms: forward pass |
| (noun) an electrical device that sends or receives radio or television signals | Synonyms: antenna, transmitting aerial |
| aerialist | (noun) an acrobat who performs in the air (as on a rope or trapeze) | - |
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| aerially | (adverb) by means of aircraft | - |
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| aerides | (noun) any orchid of the genus Aerides | - |
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| aerie | (noun) any habitation at a high altitude | Synonyms: aery, eyrie, eyry |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aery, eyrie, eyry |
| aeriferous | (adjective) conveying air; as the bronchial tubes | - |
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| aeriform | (adjective) resembling air or having the form of air | Synonyms: airlike |
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| (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aerial, aery, airy, ethereal |
| aerify | (verb) turn into gas | Synonyms: gasify, vaporise, vaporize |
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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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| aerobe | (noun) an organism (especially a bacterium) that requires air or free oxygen for life | - |
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| aerobic | (adjective) depending on free oxygen or air | Synonyms: aerophilic, aerophilous |
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| (adjective) based on or using the principles of aerobics; enhancing respiratory and circulatory efficiency | - |
| aerobics | (noun) exercise that increases the need for oxygen | Synonyms: aerobic exercise |
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| aerobiosis | (noun) life sustained in the presence of air or oxygen | - |
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| aerobiotic | (adjective) living or active only in the presence of oxygen | - |
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| aerodontalgia | (noun) pain in the teeth that results from a change in air pressure (as in flying or mountain climbing) | - |
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| aerodrome | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: airdrome, airport, drome |
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| aerodynamic | (adjective) of or relating to aerodynamics | - |
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| (adjective) designed or arranged to offer the least resistance to fluid flow | Synonyms: flowing, sleek, streamlined |
| aerodynamics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aeromechanics |
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| aeroembolism | (noun) obstruction of the circulatory system caused by an air bubble as, e.g., accidentally during surgery or hypodermic injection or as a complication from scuba diving | Synonyms: air embolism, gas embolism |
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| (noun) pain resulting from rapid change in pressure | Synonyms: air embolism, bends, caisson disease, decompression sickness, gas embolism |
| aerofoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: airfoil, control surface, surface |
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| aerogenerator | (noun) generator that extracts usable energy from winds | Synonyms: wind generator, windmill |
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| aerogram | (noun) a letter sent by air mail | Synonyms: aerogramme, air letter, airmail letter |
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| aerogramme | (noun) a letter sent by air mail | Synonyms: aerogram, air letter, airmail letter |
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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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| aerological | (adjective) of or pertaining to aerology | - |
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| aerology | (noun) meteorology of the total extent of the atmosphere; especially the upper layers | - |
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| aeromechanic | (adjective) of or pertaining to aerodynamics | - |
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| aeromechanics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aerodynamics |
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| aeromedical | (adjective) of or relating to aviation medicine | - |
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| aeromedicine | (noun) the study and treatment of disorders associated with flight (especially with space flight) | Synonyms: aerospace medicine, aviation medicine |
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| aeronaut | (noun) someone who operates an aircraft | Synonyms: aviator, flier, flyer |
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| 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 |
| aeschynanthus | (noun) a plant of the genus Aeschynanthus having somewhat red or orange flowers and seeds having distinctive hairs at base and apex | - |
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| aesculapian | (adjective) of or belonging to Aesculapius or the healing art | Synonyms: medical |
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| aesthesia | (noun) mental responsiveness and awareness | Synonyms: esthesia, sensibility |
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| aesthesis | (noun) an unelaborated elementary awareness of stimulation | Synonyms: esthesis, sensation, sense datum, sense experience, sense impression |
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| aesthete | (noun) one who professes great sensitivity to the beauty of art and nature | Synonyms: esthete |
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| aesthetic | (adjective) concerning or characterized by an appreciation of beauty or good taste | Synonyms: aesthetical, esthetic, esthetical |
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| (adjective) relating to or dealing with the subject of aesthetics | Synonyms: esthetic |
| (adjective) aesthetically pleasing | Synonyms: artistic, esthetic |
| (noun) (philosophy) a philosophical theory as to what is beautiful | Synonyms: esthetic |
| aesthetical | (adjective) concerning or characterized by an appreciation of beauty or good taste | Synonyms: aesthetic, esthetic, esthetical |
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| aesthetically | (adverb) in a tasteful way | Synonyms: esthetically |
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| aesthetician | (noun) a philosopher who specializes in the nature of beauty | Synonyms: esthetician |
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| (noun) a worker skilled in giving beauty treatments (manicures and facials etc.) | Synonyms: esthetician |
| aesthetics | (noun) (art) the branch of philosophy dealing with beauty and taste (emphasizing the evaluative criteria that are applied to art) | Synonyms: esthetics |
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| aestival | (adjective) (rare) of or occurring in summer | Synonyms: estival |
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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 |
| 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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| aetiologic | (adjective) relating to the etiology of a disease | Synonyms: aetiological, etiologic, etiological |
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| (adjective) of or relating to the philosophical study of causation | Synonyms: aetiological, etiologic, etiological |
| aetiological | (adjective) relating to the etiology of a disease | Synonyms: aetiologic, etiologic, etiological |
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| (adjective) of or relating to the philosophical study of causation | Synonyms: aetiologic, etiologic, etiological |
| aetiologist | (noun) a specialist in the etiology of diseases | Synonyms: etiologist |
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| aetiology | (noun) the philosophical study of causation | Synonyms: etiology |
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| (noun) the cause of a disease | Synonyms: etiology |
| 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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| affability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affableness, amiability, amiableness, bonhomie, geniality |
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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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| affably | (adverb) in an affable manner | Synonyms: amiably, genially |
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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 |
| affect | (noun) the conscious subjective aspect of feeling or emotion | - |
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| (verb) act physically on; have an effect upon | - |
| (verb) have an effect upon | Synonyms: bear on, bear upon, impact, touch, touch on |
| (verb) make believe with the intent to deceive | Synonyms: dissemble, feign, pretend, sham |
| (verb) have an emotional or cognitive impact upon | Synonyms: impress, move, strike |
| (verb) connect closely and often incriminatingly | Synonyms: involve, regard |
| affectation | (noun) a deliberate pretense or exaggerated display | Synonyms: affectedness, mannerism, pose |
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| affected | (adjective) acted upon; influenced | - |
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| (adjective) speaking or behaving in an artificial way to make an impression | Synonyms: unnatural |
| (adjective) being excited or provoked to the expression of an emotion | Synonyms: moved, stirred, touched |
| affectedly | (adverb) in an affected manner | - |
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| affectedness | (noun) a deliberate pretense or exaggerated display | Synonyms: affectation, mannerism, pose |
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| (noun) the quality of being false or artificial (as to impress others) | - |
| affecting | (adjective) arousing affect | Synonyms: poignant, touching |
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| affectingly | (adverb) in a poignant or touching manner | Synonyms: poignantly, touchingly |
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| affection | (noun) a positive feeling of liking | Synonyms: affectionateness, fondness, heart, philia, tenderness, warmheartedness, warmness |
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| affectional | (adjective) characterized by emotion | Synonyms: affective, emotive |
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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 |
| affective | (adjective) characterized by emotion | Synonyms: affectional, emotive |
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| 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 |
| affiance | (verb) give to in marriage | Synonyms: betroth, engage, plight |
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| affiant | (noun) a person who makes an affidavit | - |
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