| 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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| aquanaut | (noun) an underwater swimmer equipped with a face mask and foot fins and either a snorkel or an air cylinder | Synonyms: skin-diver |
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| (noun) a skilled worker who can live in underwater installations and participate in scientific research | Synonyms: oceanaut |
| argonaut | (noun) someone engaged in a dangerous but potentially rewarding adventure | - |
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| astronaut | (noun) a person trained to travel in a spacecraft | Synonyms: cosmonaut, spaceman |
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| astronautic | (adjective) of or belonging to astronauts or the science of astronautics | Synonyms: astronautical |
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| astronautical | (adjective) of or belonging to astronauts or the science of astronautics | Synonyms: astronautic |
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| astronautics | (noun) the theory and practice of navigation through air or space | Synonyms: aeronautics |
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| banausic | (adjective) (formal) ordinary and not refined | - |
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| binaural | (adjective) relating to or having or hearing with two ears | Synonyms: biaural |
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| binaurally | (adverb) in a binaural manner | Synonyms: in both ears, to both ears |
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| carnauba | (noun) Brazilian fan palm having an edible root; source of a useful leaf fiber and a brittle yellowish wax | Synonyms: carnauba palm, Copernicia cerifera, Copernicia prunifera, wax palm |
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| (noun) hard yellowish to brownish wax from leaves of the carnauba palm used especially in floor waxes and polishes | Synonyms: carnauba wax |
| cosmonaut | (noun) a person trained to travel in a spacecraft | Synonyms: astronaut, spaceman |
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| cybernaut | (noun) a computer user who uses the internet; someone who explores cyberspace | - |
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| dreadnaught | (noun) battleship that has big guns all of the same caliber | Synonyms: dreadnought |
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| inaudibility | (noun) the quality of not being perceptible by the ear | Synonyms: inaudibleness |
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| inaudible | (adjective) impossible to hear; imperceptible by the ear | Synonyms: unhearable |
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| inaudibleness | (noun) the quality of not being perceptible by the ear | Synonyms: inaudibility |
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| inaudibly | (adverb) in an inaudible manner | - |
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| inaugural | (adjective) occurring at or characteristic of a formal investiture or induction | - |
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| (adjective) serving to set in motion | Synonyms: first, initiative, initiatory, maiden |
| (noun) the ceremonial induction into a position | Synonyms: inauguration |
| (noun) an address delivered at an inaugural ceremony (especially by a United States president) | Synonyms: inaugural address |
| inaugurally | (adverb) so as to inaugurate | - |
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| inaugurate | (verb) be a precursor of | Synonyms: introduce, usher in |
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| (verb) commence officially | Synonyms: kick off |
| (verb) open ceremoniously or dedicate formally | - |
| inauguration | (noun) the ceremonial induction into a position | Synonyms: inaugural |
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| (noun) the act of starting a new operation or practice | Synonyms: startup |
| inauspicious | (adjective) not auspicious; boding ill | Synonyms: unfortunate |
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| (adjective) contrary to your interests or welfare | Synonyms: adverse, untoward |
| (adjective) presaging ill fortune | Synonyms: ill, ominous |
| inauspiciously | (adverb) in an inauspicious manner | Synonyms: unpropitiously |
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| inauspiciousness | (noun) the quality of suggesting an unsuccessful result | Synonyms: unpropitiousness |
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| inauthentic | (adjective) false or fake; not what it appears to be | Synonyms: spurious, unauthentic |
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| juggernaut | (noun) a massive inexorable force that seems to crush everything in its way | Synonyms: steamroller |
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| monaul | (noun) brilliantly colored pheasant of southern Asia | Synonyms: monal |
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| monaural | (adjective) relating to or having or hearing with only one ear | - |
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| monaurally | (adverb) in a monaural manner | Synonyms: in one ear, to one ear |
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| nauch | (noun) an intricate traditional dance in India performed by professional dancing girls | Synonyms: nautch, nautch dance |
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| naught | (noun) complete failure | - |
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| (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, cypher, goose egg, nada, nil, nix, nothing, null, zero, zilch, zip, zippo |
| naughtily | (adverb) in a disobedient or naughty way | Synonyms: badly, mischievously |
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| naughtiness | (noun) an attribute of mischievous children | Synonyms: badness, mischievousness |
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| naughty | (adjective) badly behaved | - |
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| (adjective) suggestive of sexual impropriety | Synonyms: blue, gamey, gamy, juicy, racy, risque, spicy |
| naumachia | (noun) a naval spectacle; a mock sea battle put on by the ancient Romans | Synonyms: naumachy |
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| naumachy | (noun) a naval spectacle; a mock sea battle put on by the ancient Romans | Synonyms: naumachia |
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| naupathia | (noun) motion sickness experienced while traveling on water | Synonyms: mal de mer, seasickness |
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| nausea | (noun) disgust so strong it makes you feel sick | - |
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| (noun) the state that precedes vomiting | Synonyms: sickness |
| nauseant | (noun) a medicine that induces nausea and vomiting | Synonyms: emetic, vomit, vomitive |
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| nauseate | (verb) cause aversion in; offend the moral sense of | Synonyms: churn up, disgust, revolt, sicken |
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| (verb) upset and make nauseated | Synonyms: sicken, turn one's stomach |
| nauseated | (adjective) feeling nausea; feeling about to vomit | Synonyms: nauseous, queasy, sick, sickish |
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| nauseating | (adjective) causing or able to cause nausea | Synonyms: loathsome, nauseous, noisome, offensive, queasy, sickening, vile |
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| nauseatingness | (noun) extreme unpalatability to the mouth | Synonyms: disgustingness, distastefulness, sickeningness, unsavoriness |
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| nauseous | (adjective) feeling nausea; feeling about to vomit | Synonyms: nauseated, queasy, sick, sickish |
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| (adjective) causing or able to cause nausea | Synonyms: loathsome, nauseating, noisome, offensive, queasy, sickening, vile |
| nautch | (noun) an intricate traditional dance in India performed by professional dancing girls | Synonyms: nauch, nautch dance |
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| nautical | (adjective) relating to or involving ships or shipping or navigation or seamen | Synonyms: marine, maritime |
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| nautilus | (noun) cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions | Synonyms: chambered nautilus, pearly nautilus |
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| (noun) cephalopod mollusk of warm seas whose females have delicate papery spiral shells | Synonyms: Argonaut, Argonauta argo, paper nautilus |
| (noun) a submarine that is propelled by nuclear power | Synonyms: nuclear-powered submarine, nuclear submarine |
| nonautonomous | (adjective) (of peoples and political bodies) controlled by outside forces | Synonyms: nonsovereign |
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| oceanaut | (noun) a skilled worker who can live in underwater installations and participate in scientific research | Synonyms: aquanaut |
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| schnauzer | (noun) old German breed of sturdy black or greyish wire-haired terriers having a blunt muzzle ranging in size from fairly small to very large; used as ratters and guard dogs or police dogs | - |
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| unau | (noun) relatively small fast-moving sloth with two long claws on each front foot | Synonyms: Choloepus didactylus, two-toed sloth, unai |
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| (noun) a sloth of Central America that has two long claws on each forefoot and three long claws on each hindfoot | Synonyms: Choloepus hoffmanni, two-toed sloth, unai |
| unauthentic | (adjective) false or fake; not what it appears to be | Synonyms: inauthentic, spurious |
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| unauthorised | (adjective) not endowed with authority | Synonyms: unauthorized |
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| (adjective) without official authorization | Synonyms: unauthorized, wildcat |
| unauthorized | (adjective) not endowed with authority | Synonyms: unauthorised |
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| (adjective) without official authorization | Synonyms: unauthorised, wildcat |