| apt | (adjective) being of striking appropriateness and pertinence | Synonyms: apposite, pertinent |
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| (adjective) (usually followed by `to') naturally disposed toward | Synonyms: disposed, given, minded, tending |
| (adjective) mentally quick and resourceful | Synonyms: clever |
| (adjective) at risk of or subject to experiencing something usually unpleasant | Synonyms: liable |
| apteral | (adjective) having columns at one or both ends but not along the sides | - |
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| (adjective) (of insects) without wings | Synonyms: apterous |
| apterous | (adjective) (of insects) without wings | Synonyms: apteral |
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| apteryx | (noun) nocturnal flightless bird of New Zealand having a long neck and stout legs; only surviving representative of the order Apterygiformes | Synonyms: kiwi |
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| aptitude | (noun) inherent ability | - |
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| aptitudinal | (adjective) of or relating to aptitudes | - |
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| aptly | (adverb) with competence; in a competent capable manner | Synonyms: ably, capably, competently |
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| aptness | (noun) appropriateness for the occasion | Synonyms: appositeness |
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| (noun) a disposition to behave in a certain way | Synonyms: propensity |