LSJ
α, ον, = Ἰωνικός, τρόπος, of the Ionic dialect, Philostr. VA 7.35; — fem. Ἰωνίς, ίδος, Ionian, Paus. 6.22.7, etc. ; as Subst., Call. Epigr. 27, Plu. Luc. 18; Ἰωνιάς, άδος, Nic. Fr. 74.4, Str. 8.3.32.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)