#1 idiom n. [parlance] a manner of speaking that is natural to native speakers of a language. wn
#2 idiom n. [dialect, accent] the usage or vocabulary that is characteristic of a specific group of people; "the immigrants spoke an odd dialect of English"; "he has a strong German accent"; "it has been said that a language is a dialect with an army and navy". wn
#3 idiom n. [artistic style] the style of a particular artist or school or movement; "an imaginative orchestral idiom". wn
#4 idiom n. [idiomatic expression, phrasal idiom, set phrase, phrase] an expression whose meanings cannot be inferred from the meanings of the words that make it up. wn
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