[ˈɪdɪəm], (Noun)

Definitions:
- a group of words established by usage as having a meaning not deducible from those of the individual words (e.g. over the moon, see the light)

- a characteristic mode of expression in music or art
(e.g: they were both working in a neo-impressionist idiom)


Phrases:

Origin:
late 16th century: from French idiome, or via late Latin from Greek idiōma ‘private property, peculiar phraseology’, from idiousthai ‘make one's own’, from idios ‘own, private’