Webster's English Dictionary

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idiom

id.i.om \'id-e--*m\ n [MF & LL; MF idiome, fr. LL idioma individual 
   peculiarity of langua]ge, fr. Gk idio-mat-, idio-ma, fr. idiousthai to 
   appropriate, fr. idios 1a: the language peculiar to a people or to a 
   district, community, or class  : DIALECT 1b: the syntactical, grammatical, 
   or structural form peculiar to a language  2: an expression in the usage of 
   a language that is peculiar to itself eith er grammatically (as no, it 
   wasn't me) or in having a meaning that cannot be derived from the conjoined 
   meanings of its elements (as Monday week for "the Monday a week after next 
   Monday") 3: a style or form of artistic expression that is characteristic 
   of an indi vidual, a period or movement, or a medium or instrument