| axiom | (noun) a saying that is widely accepted on its own merits | Synonyms: maxim |
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| (noun) (logic) a proposition that is not susceptible of proof or disproof; its truth is assumed to be self-evident | - |
| idiom | (noun) the style of a particular artist or school or movement | Synonyms: artistic style |
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| (noun) the usage or vocabulary that is characteristic of a specific group of people | Synonyms: accent, dialect |
| (noun) an expression whose meanings cannot be inferred from the meanings of the words that make it up | Synonyms: idiomatic expression, phrasal idiom, phrase, set phrase |
| (noun) a manner of speaking that is natural to native speakers of a language | Synonyms: parlance |