Lexical Definition

‎ἑτεροζυγέω‎ heterozygéō (het-er-od-zoog-eh'-o) to yoke a mismatch ^G:V
from a compound of ‎ἕτερος‎ and ‎ζυγός‎

unequally yoke together with.

• to yoke up differently, i.e. (figuratively) to associate discordantly

Abbott-Smith

*† ἑτερο-ζυγέω, -ῶ [in LXX cf. ἑτερόζυγος, Le 19:19 (כִּלְאַיִם)* ;]
to be unequally yoked: metaph., c. dat. pers., II Co 6:14.†

Abbott-Smith References

Liddell-Scott-Jones

ἑτεροζυγέω-ζῠγέω,

draw unequally, [Refs 2nd c.AD+] to be yoked in unequal partnership with unbelievers, [NT]

_{LSJ Scripture Refs: 2Cor.6.14}