idiom

(noun) a manner of speaking that is natural to native speakers of a language. Synonyms: parlance.

(noun) the usage or vocabulary that is characteristic of a specific group of people. Synonyms: dialect, accent. Examples: "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."

(noun) the style of a particular artist or school or movement. Synonyms: artistic style. Example: "An imaginative orchestral idiom."

(noun) an expression whose meanings cannot be inferred from the meanings of the words that make it up. Synonyms: idiomatic expression, phrasal idiom, set phrase, phrase.