Unfaithfulness to the marriage vow or contract; violation of the marriage covenant by adultery
Want of faith or belief in some religious system; especially, a want of faith in, or disbelief of, the inspiration of the Scriptures, of the divine origin of Christianity
Breach of trust; unfaithfulness to a charge, or to moral obligation; treachery; deceit; as, the infidelity of a servant
Infidelity occurs when a person who is married or in a steady relationship has sex with another person. George ignored his partner's infidelities. infidelities when someone has sex with a person who is not their wife, husband, or partner