pact

pact / pækt / noun [ countable ]

a formal agreement between two groups, countries, or people, especially to help each other or to stop fighting SYN treaty :

the Warsaw pact

make/sign a pact

The two countries signed a non-aggression pact.

pact with

a defence pact with the USA

pact between

a peace pact between the rebels and the government

→ suicide pact