1.
The nomination or designation of candidates for public office by direct popular vote rather than through the action of a convention or body of elected nominating representatives or delegates. The term is applied both to the nomination of candidates without any nominating convention, and, loosely, to the nomination effected, as in the case of candidates for president or senator of the United States, by the election of nominating representatives pledged or instructed to vote for certain candidates dssignated by popular vote.(Political Science)