1an object used to indicate a position, place, or route:they erected a granite marker at the crash site
[in singular] a distinctive feature or characteristic indicative of a particular quality or condition:identification with one’s own language has always been a marker of nationalism
a thing serving as a standard of comparison:he has already laid down a marker by setting a fast time during practice
a radio beacon used to guide the pilot of an aircraft.
Genetics an allele used to identify a chromosome or to locate other genes on a genetic map.
2 (also marker pen) a felt-tip pen with a broad tip:a heavy line drawn by a marker
3British (in team games) a player who stays close to an opponent to prevent them from getting or passing the ball:Quinn took the ball wide of his marker
4British a person who assesses the standard of a test or examination:the aim of the marker is to help the student do better next time
a person who records the score in snooker, billiards, or squash.
5North American informal a promissory note; an IOU:we’ll give you a marker, you give us the car
