| 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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