/ Dictionary / Index M marker: Meaning and Definition of Find definitions for: mark•er Pronunciation: (mär'kur), [key] — n. 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. See an object, as a book or topcoat left at a library table, used to establish territorial possession in a public place. 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 calleda pen designed for making bold, colorful, or indelible marks, as in making signs or identifying objects. 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 calleda grade of oil on which prices of other crude oils are based. one's location while driving on a highway, as determined by the nearest milepost. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: marker (Thesaurus) marked marker gene Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language