1) to forget
2) neglecting, no longer caring for
2) forgotten, given over to oblivion, i.e. uncared for
Part of Speech: verb
Middle voice from G1909 and G2990; to lose out of mind; by implication to neglect: - (be) forget (-ful of).
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 ἐπιλανθάνομαι; click on the second column to search for that grammatical form of the root ἐπιλανθάνομαι; click on the third column to search for that word and grammatical form; click on the total to search for the root ἐπιλανθάνομαι.