idiomaticEnglishOxford Dictionary of Englishidiomatic /ˌɪdiəˈmatɪk / ▸ adjective 1 using, containing, or denoting expressions that are natural to a native speaker: he spoke fluent, idiomatic English. 2 appropriate to the style of art or music associated with a particular period, individual, or group: a short Bach piece containing lots of idiomatic motifs. – DERIVATIVES idiomatically /ˌɪdiəˈmatɪkli / adverb– ORIGIN early 18th century: from Greek idiōmatikos ‘peculiar, characteristic’, from idiōma (see idiom).