Meaning of MARKER in English

MARKER

n.1 a stone, post, etc., used to mark a position, place reached, etc.

2 a person or thing that marks.

3 a felt-tipped pen with a broad tip.

4 a person who records a score, esp. in billiards.

5 a flare etc. used to direct a pilot to a target.

6 a bookmark.

7 US sl. a promissory note; an IOU.

Oxford English vocab.      Оксфордский английский словарь.