pact

a pact of peace and concord.

They made a pact not to tell anyone.

a defence pact between Pakistan and France

a defence pact between Pakistan and Gambia

the pact called on the rival forces to pull back and allow a neutral force to take control.

The signing in Moscow's Kremlin on the night of August 23-24 of the Nazi-Communist "NonAggression" Pact was a diplomatic demarche literally world-shattering.