1. A piece of cloth, usually rectangular, of distinctive color and design, used as a symbol, standard, signal, or emblem.

2. National or other allegiance, as symbolized by a flag: ships of the same flag.

3. A ship carrying the flag of an admiral; a flagship.

4. A marking device, such as a gummed strip of paper, attached to an object to attract attention or ease identification; a tab.

5. The masthead of a newspaper.

6. Music A cross stroke that halves the value of a note to which it is added.

7. A distinctively shaped or marked tail, as of a dog or deer.

8. Computers A variable or memory location that stores true-or-false, yes-or-no information.

1. To mark with a flag or flags for identification or ornamentation: flag a parade route; flagging parts of a manuscript for later review.