| advantageously | (adverb) in a manner affording benefit or advantage | Synonyms: well |
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| advantageousness | (noun) the quality of being encouraging or promising of a successful outcome | Synonyms: favorableness, favourableness, positiveness, positivity, profitableness |
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| advect | (verb) convey by horizontal mass movement of a fluid | - |
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| advection | (noun) (meteorology) the horizontal transfer of heat or other atmospheric properties | - |
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| advective | (adjective) of or relating to advection | - |
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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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| adventitial | (adjective) of or pertaining to the adventitia | - |
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| adventitious | (adjective) associated by chance and not an integral part | - |
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| adventive | (adjective) not native and not fully established; locally or temporarily naturalized | - |
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| adventure | (noun) a wild and exciting undertaking (not necessarily lawful) | Synonyms: dangerous undertaking, escapade, risky venture |
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| (verb) put at risk | Synonyms: hazard, jeopardize, stake, venture |
| (verb) take a risk in the hope of a favorable outcome | Synonyms: chance, gamble, hazard, risk, run a risk, take a chance, take chances |
| 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 |
| adventuresome | (adjective) willing to undertake or seeking out new and daring enterprises | Synonyms: adventurous |
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| adventuress | (noun) a woman adventurer | - |
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| adventurism | (noun) recklessness in politics or foreign affairs | - |
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| adventuristic | (adjective) of or pertaining to adventurism | - |
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| adventurous | (adjective) willing to undertake or seeking out new and daring enterprises | Synonyms: adventuresome |
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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 | (adjective) of or relating to or functioning as an adverb | - |
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| (noun) a word or group of words function as an adverb | - |
| adverbially | (adverb) as an adverb | - |
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| adversary | (noun) someone who offers opposition | Synonyms: antagonist, opponent, opposer, resister |
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| adversative | (adjective) expressing antithesis or opposition | Synonyms: oppositive |
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| adverse | (adjective) in an opposing direction | Synonyms: contrary |
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| (adjective) contrary to your interests or welfare | Synonyms: inauspicious, untoward |
| adversely | (adverb) in an adverse manner | - |
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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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| (verb) make a more or less disguised reference to | Synonyms: allude, touch |
| (verb) make reference to | Synonyms: bring up, cite, mention, name, refer |
| (verb) give heed (to) | Synonyms: attend, give ear, hang, pay heed |
| 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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| advertent | (adjective) giving attention | Synonyms: heedful |
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| advertently | (adverb) in a careful deliberate manner | Synonyms: heedfully, mindfully |
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| advertise | (verb) make publicity for; try to sell (a product) | Synonyms: advertize, promote, push |
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| (verb) call attention to | Synonyms: advertize, publicise, publicize |
| advertised | (adjective) called to public attention | - |
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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 |
| advertize | (verb) make publicity for; try to sell (a product) | Synonyms: advertise, promote, push |
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| (verb) call attention to | Synonyms: advertise, publicise, publicize |
| 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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| advisable | (adjective) worthy of being recommended or suggested; prudent or wise | - |
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| advise | (verb) give advice to | Synonyms: counsel, rede |
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| (verb) inform (somebody) of something | Synonyms: apprise, apprize, give notice, notify, send word |
| (verb) make a proposal, declare a plan for something | Synonyms: propose, suggest |
| advised | (adjective) having the benefit of careful prior consideration or counsel | Synonyms: well-advised |
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| (adjective) having received information | - |
| advisedly | (adverb) with intention; in an intentional manner | Synonyms: by choice, by design, deliberately, designedly, intentionally, on purpose, purposely |
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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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| 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 |
| adze | (noun) an edge tool used to cut and shape wood | Synonyms: adz |
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| aecial | (adjective) of or belonging to an aecium | - |
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| aeciospore | (noun) spore of a rust fungus formed in an aecium | - |
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| aecium | (noun) fruiting body of some rust fungi bearing chains of aeciospores | - |
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| aegir | (noun) a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary) | Synonyms: bore, eager, eagre, tidal bore |
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| aegis | (noun) kindly endorsement and guidance | Synonyms: auspices, protection |
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| (noun) armor plate that protects the chest; the front part of a cuirass | Synonyms: breastplate, egis |
| aeolotropic | (adjective) having properties with different values along different axes | Synonyms: eolotropic |
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| aeon | (noun) (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe | Synonyms: eon |
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| (noun) an immeasurably long period of time | Synonyms: eon |
| (noun) the longest division of geological time | Synonyms: eon |
| aeonian | (adjective) of or relating to a geological eon (longer than an era) | Synonyms: eonian |
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| (adjective) continuing forever or indefinitely | Synonyms: ageless, eonian, eternal, everlasting, perpetual, unceasing, unending |
| aepyornis | (noun) huge (to 9 ft.) extinct flightless bird of Madagascar | Synonyms: elephant bird |
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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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| 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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