Definitions:

1. A formal agreement between tow or more parties, especially to resolve a conflict, cooperate, or achieve a common goal. NOUN
   • The nations signed a pact to reduce carbon emissions.
2. A written agreement between two states or sovereigns. NOUN
   • The nations forged a pact to ensure mutual security and cooperation.
3. An agreement or arrangement between tow or more parties, nations, groups or individuals. NOUN
   • The government made a pact with the rebels to lay down their arms.

Synonyms:

• accord
• agreement
• alliance
• contract
• deal
• treaty