1. [noun] (US) A meeting, especially a preliminary meeting, of persons belonging to a party, to nominate candidates for public office, or to select delegates to a nominating convention, or to confer regarding measures of party policy; a political primary meeting.
2. [noun] (US) (Canada) A grouping of all the members of a legislature from the same party.
3. [verb] (US) To meet and participate in caucus.
4. [noun] A closed political meeting.
5. [verb] Meet to select a candidate or promote a policy.
