n. One who or that which foreruns; an annunciator; a harbinger: as, John the Baptist was the forerunner of Christ.n. An ancestor or predecessor.n. A prognostic; a premonitory token; a sign foreshowing something to follow: as, popular tumults are the forerunners of revolution.n. Nautical, a piece of bunting or other material inserted in a log-line to mark the point at which the glass must be turned.