Definition: fornication, whoredom; met: idolatry. HELPS Word-studies. 4202 porneÃ­a (the root of the English terms pornography, pornographic; cf. 4205 /pÃ³rnos) which is derived from pernaÅ, to sell off) â properly, a selling off (surrendering) of sexual purity; promiscuity of any (every) type.