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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.

Digital Technology.��a navigation pointer or other indicator in a graphical user interface: Place markers at the beginning and end of your selection to trim your video in edit mode.

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.��

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

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

Slang.��

1. a debt, especially a gambling debt.

2. a written or signed promise to pay a debt, especially 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.