mul·ti·lateral \| ̷ ̷ ̷ ̷ at multi-+\adjective Etymology:multi- + lateral 1.: having many sides : many-sided 2. a.: participated in by or involving more than two states < multilateral treaty > < multilateral guarantees > < multilateral trade > b.of a contract: having three or more parties 3.of a secondary school: offering several distinct curricula — compare comprehensive 3b • mul·ti·laterally\“+\adverb