1) on the morrow, the next day
Part of Speech: adverb
From G1909 and G839; occuring on the succeeding day, that is, (G2250 being implied) tomorrow: - day following, morrow, next day (after).
|(τῇ ἐπαύριον) the next day||67.208|
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root ἐπαύριον; click on the second column to search for that grammatical form of the root ἐπαύριον; click on the third column to search for that word and grammatical form; click on the total to search for the root ἐπαύριον.