Entry derived, according to Adler, from the (source of the) Ambrosian Lexicon (1782a).
Normal orthography would write the headword as two words, and accent the second one differently: e)pei\ h)= ('since indeed'); see Homer, Iliad 4.56, plus scholion.
See LSJ for h)= I.2 (web address 1); and cf. generally epsilon 2113, epsilon 2118.