■ noun
1》 a way in which something is usually done.
↘socially acceptable behaviour.
2》 an agreement between states, especially one less formal than a treaty.
3》 a large meeting, especially of members of a political party or a profession.
↘ N. Amer. an assembly of the delegates of a political party to select candidates for office.
↘a body set up by agreement to deal with a particular issue.
↘ historical a meeting of Parliament without a summons from the sovereign.
4》 Bridge a bid or system of bidding by which the bidder tries to convey specific information about the hand to their partner.
Origin
ME: via OFr. from L. conventio(n-) 'meeting, covenant', from convenire (see convene ).