Definition of caucus
A caucus is a meeting organised by a political party to award the delegates of a particular state in the party’s national nominating process in the US.
Each precinct of the caucus, which takes place in the stead of a primary, meets locally and reports its results to the state party. Caucuses sometimes require individuals to publicly announce their vote and the voting period is often preceded by speeches from representatives from each candidate’s campaign.
Since 1972, Iowa has kicked off the presidential nominating process with its first-in-the-nation caucuses.