ETYM Latin adulterium. Related to Advoutry.
Extramarital sex that willfully and maliciously interferes with marriage relations; SYN. criminal conversation, fornication.
Voluntary sexual intercourse between a married person and someone other than his or her legal partner.
It is almost universally recognized as grounds for divorce in the US, and is a punishable offense in some states. The legal definition of adultery varies: in some states both parties have to be married (to other people); in others it is adultery if the woman is married but not if only the man is married, and so on. + prikaži više

ETYM French duplicité, Latin duplicitas, from duplex double. Related to Duplex.
Acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another; SYN. double-dealing.

ETYM Latin infidelitas: cf. French infidélité.
The quality of being unfaithful; SYN. unfaithfulness.