Dictionary entry

ἐκπορνεύω

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

ἐκ-πορνεύω

[in LXX chiefly for זָנָה, freq. of spiritual unfaithfulness;]

strengthened form of πoρνεύω, implying excessive indulgence; mid, to give oneself up to fornication: Ju 7.†