Definitions from Wiktionary ( )

▸ noun:  Someone or something that creates marks, particularly
▸ noun:  A felt-tipped pen, a marker pen.
▸ noun:  A scorekeeper, especially one who tallies billiard scores.
▸ noun:  (paintball) A device that fires a paintball.
▸ noun:  Someone or something used to mark a position or amount, particularly
▸ noun:  A real or virtual objective, something to be aimed for.
▸ noun:  (film, theater) A location on a stage or set where an actor is to stand or move to during a scene, usually indicated by a small X design placed on the floor.
▸ noun:  A direction issued by a camera operator for actors to be on their locations in readiness for a take.
▸ noun:  (US, slang) Synonym of IOU, an informal record of a debt.
▸ noun:  (linguistics) A free or bound morpheme indicating a grammatical function.
▸ noun:  (biology) A gene or DNA sequence with a known location on a chromosome that can be used to identify individuals or species.
▸ noun:  (biology, medicine) A substance used as an indicator for diagnosis or other analysis, a biomarker.
▸ noun:  (military) The soldier who forms the pilot of a wheeling column or marks the direction of an alignment.
▸ noun:  A sewing machine attachment that creases the fabric to mark a line
▸ noun:  A counter, especially one used in card games or backgammon.
▸ noun:  Any of various objects that mark a place on the landscape, such as a milepost, blaze, or surveyor's cairn.
▸ noun:  (UK) Someone who assigns marks on tests, examinations, etc.; a grader.
▸ noun:  (uncountable, colloquial) The ink marks or residue of a felt-tipped pen.
▸ noun:  (figurative) A personal favor owed to someone, whether written or not.
▸ noun:  (competition law) A formal certification that a company was the first to approach a competition authority to reveal the existence of a cartel, generally entitling it to greater leniency during the cartel's dissolution and punishment.
▸ noun:  (sports) A player on defense used to mark one or more offensive players.
▸ noun:  (dated) A player employed by a private club to compete against members.
▸ noun:  (Philippines, informal, basketball, volleyball) A point, unit of scoring in a game or competition.
▸ verb:  To mark or write on (something) using a marker
▸ noun:  (linguistics) Short for discourse marker. [(linguistics) A word or phrase that marks a boundary in a discourse, typically as part of a dialogue. Discourse markers often signal topic changes, reformulations, discourse planning, stressing, hedging, or backchanneling.]

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