The Hebrew and Greek that is translated as «adultery» in English (here etymologically meaning «to alter») is typically understood as «marital infidelity.» It is (back-) translated in the following ways:

• Highland Totonac: «to do something together»
• Yucateco: «pair-sin»
• Ngäbere: «robbing another’s half self-possession» (compare «fornication» which is «robbing self-possession,» that is, to rob what belongs to a person)
• Kaqchikel, Chol: «to act like a dog» (see also licentiousness)
• Toraja-Sa’dan: «to measure the depth of the river of (another’s) marriage»
• North Alaskan Inupiatun: «married people using what is not theirs» (compare «fornication» which is «unmarried people using what is not theirs») (source for this and all above: Bratcher / Nida)
• Purari: “play hands with” or “play eyes with”
• Chicahuaxtla Triqui: «talk secretly with spouses of our fellows»
• Isthmus Zapotec: «go in with other people’s spouses»
• Tzeltal: «practice illicit relationship with women»
• Huehuetla Tepehua: «live with some one who isn’t your wife»
• Central Tarahumara: «sleep with a strange partner»
• Hopi: «tamper with marriage» (source for this and seven above: Waterhouse / Parrott in Notes on Translation October 1967, p. 1ff.)
• German: Ehebrecher or «marriage breaker» / Ehe brechen or «breaking of marriage» (source: Zetzsche)
• In Falam Chin the term for «adultery» is the phrase for “to share breast” which relates to adultery by either sex. (Source: David Clark)
• In Ixcatlán Mazatec a specification needs to be made to include both genders. (Source: Robert Bascom)
• Likewise in Hiligaynon: «commit-adultery-with-a-man or commit-adultery-with-a-woman» (source: Hiligaynon Back Translation)

See also adultery, adulterer, adulteress, and you shall not commit adultery.