A pact is a formal agreement between two or more people, organizations, or governments to do a particular thing or to help each other.
例句
Last month he signed a new non-aggression pact with Germany...上個月，他與德國簽訂了新的互不侵犯條約。The other two opposition parties cannot agree on an electoral pact between themselves.另外兩個反對黨之間無法就選舉達成協議。