1) to come to arrive
1a) of time, come on, be at hand, be future
2) to come upon, overtake, one
2a) of sleep
2b) of disease
2c) of calamities
2d) of the Holy Spirit, descending and operating in one
2e) of an enemy attacking one
Part of Speech: verb
Citing in TDNT: 2:680, 257
From G1909 and G2064; to supervene, that is, arrive, occur, impend, attack, (figuratively) influence: - come (in, upon).
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 ἐπέρχομαι; click on the second column to search for that grammatical form of the root ἐπέρχομαι; click on the third column to search for that word and grammatical form; click on the total to search for the root ἐπέρχομαι.