Multilateral (adjective)

1. Involving more than two parties or sides.
2. Involves three or more countries or parties.

Origin:

Mid 19th century: from latin multus "many" + lateral "of or on the side".

Examples:

1. The treaty was signed by several countries and it was a multilateral agreement.
2. The negotiations were multilateral and included representatives from several countries.
3. The multinational corporation had a multilateral approach to its business.
4. The multilateral treaty was signed by many countries.
5. The multilateral summit was attended by the leaders of many nations.