Lexicon :: Strong's G4202 - porneia

πορνεία, πορνείας, ἡ (πορνεύω), the Sept. for תַּזְנוּת, זְנוּת, זְנוּנִים, fornication (Vulg. fornicatio (and (Revelation 19:2) prostitutio)); used
a. properly, of illicit sexual intercourse in general (Demosthenes, 403, 27; 433, 25): Acts 15:20, 29; Acts 21:25 (that this meaning must be adopted in these passages will surprise no one who has learned from 1 Corinthians 6:12ff how leniently converts from among the heathen regarded this vice and how lightly they indulged in it; accordingly, all other interpretations of the term, such as of marriages within the prohibited degrees and the like, are to be rejected); Romans 1:29 Rec.; 1 Corinthians 5:1; 1 Corinthians 6:13, 18; 1 Corinthians 7:2; 2 Corinthians 12:21; Ephesians 5:3; Colossians 3:5; 1 Thessalonians 4:3; Revelation 9:21; it is distinguished from μοιχεία in Matthew 15:19; Mark 7:21; and Galatians 5:19 Rec.; used of adultery ((cf. Hosea 2:2 (4), etc.)), Matthew 5:32; Matthew 19:9.
b. In accordance with a form of speech common in the O. T. and among the Jews which represents the close relationship existing between Jehovah and his people under the figure of a marriage (cf. Gesenius, Thesaurus, i., p. 422{a} following), πορνεία is used metaphorically of the worship of idols: Revelation 14:8; Revelation 17:2, 4; Revelation 18:3; Revelation 19:2; ἡμεῖς ἐκ πορνείας οὐ γεγεννήμεθα (we are not of a people given to idolatry), ἕνα πατέρα ἔχομεν τόν Θεόν, John 8:41 (ἄθεος μέν ὁ ἄγονος, πολύθεος δέ ὁ ἐκ πόρνης, τυφλωττων περί τόν ἀληθῆ πατέρα καί διά τοῦτο πολλούς ἀνθ' ἑνός γονεῖς αἰνιττόμενος, Philo de mig. Abr. § 12; τέκνα πορνείας, of idolaters, Hosea 1:2; (but in John, the passage cited others understand physical descent to be spoken of (cf. Meyer))); of the defilement of idolatry, as incurred by eating the sacrifices offered to idols, Revelation 2:21.

BLB Scripture Index of Thayer's