Webster’s Revised Unabridged Dictionary · 1913
Idiomatic
Id′i·o·mat′ic, Id′i·o·mat′ic·al (·ĭ·kal), a. [Gr. ἰδιωματικός.] Of or pertaining to, or conforming to, the mode of expression peculiar to a language; as, an idiomatic meaning; an idiomatic phrase. — Id′i·o·mat′ic·al·ly, adv.