Affair Partner

== English == === Noun === Affair Partner (plural Affair Partners) (idiomatic, euphemistic) A person with whom one is having an extramarital or unfaithful relationship; the third party in an affair. ==== Usage notes ==== Often abbreviated as **AP** in online communities and support groups. ==== Synonyms ==== AP (initialism) lover paramour the other woman / the other man === References === Sasha Correia, PhD (2024), “Affair Subreddits Analysis: Usage of "AP" and Relationship Terminology”, in Sasha7, retrieved 4 February 2026.