The meaning of INFIDELITY is the act or fact of having a romantic or sexual relationship with someone other than one's spouse or partner. How to use infidelity in a sentence.

INFIDELITY definition: 1. (an act of) having sex with someone who is not your husband, wife, or regular sexual partner…. Learn more.

Infidelity (synonyms include cheating, having an affair, adultery, being unfaithful, non-consensual non-monogamy, straying or two-timing) is a violation of a couple's emotional or sexual …

INFIDELITY definition: marital disloyalty; adultery. See examples of infidelity used in a sentence.

Dec 8, 2025 · Infidelity—also referred to as cheating or adultery—describes the act of engaging in emotional or sexual intimacy with someone outside the agreed-upon boundaries of your …

Definition of infidelity noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Dec 5, 2025 · What is infidelity? Broadly speaking, infidelity means being unfaithful to your partner. Exactly what being unfaithful means depends on each person’s perspective. It …

Infidelity occurs when a person who is married or in a long-term relationship has sex with another person. George turned a blind eye to his partner's infidelities.

INFIDELITY meaning: the act or fact of having a romantic or sexual relationship with someone other than your husband, wife, or partner

infidelity (ˌɪnfɪˈdɛlɪtɪ) n, pl -ties 1. lack of faith or constancy, esp sexual faithfulness 2. lack of religious faith; disbelief