Definition of Idiom

Noun: idiom i-dee-um

A manner of speaking that is natural to native speakers of a language
- parlance
The usage or vocabulary that is characteristic of a specific group of people
"the immigrants spoke an odd idiom of English";
- dialect, accent
The style of a particular artist, school or movement
"an imaginative orchestral idiom";
- artistic style
An expression whose meanings cannot be inferred from the meanings of the words that make it up
- idiomatic expression, phrasal idiom, set phrase, phrase