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 (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 is the breaking of a promise to remain faithful to a romantic partner, whether that promise was a part of marriage vows, a privately uttered agreement between lovers, or an unspoken...

Dec 5, 2025 · Infidelity is the act of being unfaithful to a romantic partner. Learn how infidelity can be interpreted and how to move forward after it happens.

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 …

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

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

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

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