Flag N. [very Common] A Variable Or Quantity That Can Take On One Of Two Value

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flag n.

[very common] A variable or quantity that can
take on one of two values; a bit, particularly one that is used to
indicate one of two outcomes or is used to control which of two
things is to be done. "This flag controls whether to clear the
screen before printing the message." "The program status word
contains several flag bits." Used of humans analogously to
bit. See also hidden flag, mode bit