n. In U. S. politics:n. A local meeting of the voters of a party to nominate candidates for local offices, or to elect delegates to a convention for the nomination of more important officers.n. A similar congressional, legislative, or other gathering of leading members of a party for conference as to party measures and policy.n. n. Any meeting of managers or of interested persons for the purpose of deciding upon a line of policy, an arrangement of business, etc., to be brought before a larger meeting, as a convention.n. In Eng. politics, a large local committee of voters for the management of all electioneering business of its party: called the Birmingham system, from its introduction at Birmingham about 1880.To meet in caucus; come together and confer.