A Quick and Simple Dictionary

flag

1. Noun.  A piece of cloth, often decorated with an emblem, used as a visual signal or symbol.
2. Noun.  (nautical) A flag flown by a ship to show the presence on board of the admiral; the admiral himself, or his flagship.
3. Noun.  (nautical, often used attributively) A signal flag.
4. Noun.  The use of a flag, especially to indicate the start of a race or other event.
5. Noun.  (context, computer science) A variable or memory location that stores a true-or-false, yes-or-no value, typically either recording the fact that a certain event has occurred or requesting that a certain optional action take place.
6. Noun.  (context, computer science) In a command line interface, a notation requesting optional behavior or otherwise modifying the action of the command being invoked.
7. Noun.  (British, puerile) An abbreviation for capture the flag.
8. Verb.  To mark with a flag, especially to indicate the importance of something.
9. Verb.  (context, often with ''down'') To signal to, especially to stop a passing vehicle etc.
10. Verb.  (context, often with ''up'') To note, mark or point out for attention.
11. Verb.  (context, computing) : To signal (an event).
12. Verb.  (context, computing) : To set a program variable to ''true''.
13. Verb.  (intransitive) To weaken, become feeble.
14. Noun.  Any of various plants with sword-shaped leaves, especially irises; specifically, ''Iris pseudacorus''.
15. Noun.  (obsolete, _) A slice of turf; a sod.
16. Noun.  A slab of stone; a flagstone, a flat piece of stone used for paving.
17. Verb.  To lay down flagstones.