1) to come under an unequal or different yoke, to be unequally yoked
1a) to have fellowship with one who is not an equal: 2Co 6:14, where the apostle is forbidding Christians to have intercourse with idolaters
Part of Speech: verb
Citing in TDNT: 2:901, 301
From a compound of G2087 and G2218; to yoke up differently, that is, (figuratively) to associate discordantly: - unequally yoke together with.
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 ἑτεροζυγέω; click on the second column to search for that grammatical form of the root ἑτεροζυγέω; click on the third column to search for that word and grammatical form; click on the total to search for the root ἑτεροζυγέω.