1an object used to indicate a position, place, or route:they erected a granite marker at the crash site [as modifier]:marker posts figurativethe most portable marker of class privilege, the wearing of natural fibers
a thing serving as a standard of comparison or as an indication of what may be expected:such studies may provide a unique marker in the quest to understand the brain
a radio beacon used to guide the pilot of an aircraft.
North American informal a promissory note; an IOU:Phyllis owed a marker in the neighborhood of $100,000
2a felt-tip pen with a broad tip.
3(chiefly in soccer) a player who is assigned to mark a particular opponent.
4British a person who records the score in a game, especially in snooker or billiards.
