pact /pækt/noun 3verb 1forms 3phrases 2 noun3 •An agreement; a compact; a covenant.New sisters at the sorority have to agree to the pact set out by the former members. •An agreement between two or more nations.In response, all seven nations of the Baltic community signed the Helsinki Convention of 1974, the world's first pact to protect an entire sea against pollution from all sources. — 1989 •An alliance or coalition. verb1 •To form a pact; to agree formally.When national elites pacted in Mexico, they pacted to the advantage of the elites as against the masses and also to the advantage of the center as against the provinces. — 1992 formspacted · pacting · pacts Phrases with pact pact of silenceA tacit agreement not to discuss a certain topic sex pactAn agreement about having sex with a particular frequency, or in a particular way regardless of circumstances.