a person or thing that marks.

something used as a mark or indication, as a bookmark or tombstone.

a person who records the scores, points, etc., as in a game or contest.

a counter used in card playing.

Genetics . genetic marker.

Psychology . an object, as a book or topcoat left at a library table, used to establish territorial possession in a public place.

Linguistics .

an element of a construction, as a coordinating conjunction, that is not a part of either immediate constituent.

an element that indicates the grammatical class or function of a construction.

a small radio beacon, automatically operated, used for local navigation of vessels.

mile-marker.

Also called marker pen, marking pen. a pen designed for making bold, colorful, or indelible marks, as in making signs or identifying objects.

Slang .

a debt, esp. a gambling debt.

a written or signed promise to pay a debt, esp. a gambling debt; a promissory note or IOU.

Also called marker crude. Commerce . a grade of oil on which prices of other crude oils are based.

Citizens Band Radio Slang . one's location while driving on a highway, as determined by the nearest milepost.

noun

arrow , counter , flag , gravestone , guide , indicator , monitor , notch , peg , pole , rag , recorder , scorer , signal , stone , tombstone