1) to be related to by marriage, enter into affinity with
1a) become any one's father-in-law or son-in-law
1b) to marry the widow of a brother who has died childless
Part of Speech: verb
From G1909 and a derivative of G1062; to form affinity with, that is, (specifically) in a levirate way: - marry.
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 ἐπιγαμβρεύω; click on the second column to search for that grammatical form of the root ἐπιγαμβρεύω; click on the third column to search for that word and grammatical form; click on the total to search for the root ἐπιγαμβρεύω.