'Fornication' in the Bible

but to write to them to abstain from pollutions of idols, and from fornication, and from what is strangled, and from blood.

to abstain from things sacrificed to idols, and from blood, and from what is strangled, and from fornication; keeping yourselves from which ye will do well. Farewell.

But concerning those of the nations who have believed, we have written, deciding that they should observe no such thing, only to keep themselves both from things offered to idols, and from blood, and from things strangled, and from fornication.