Word:

Flag Day

Noun1.Flag Day - commemorating the adoption of the U.S. flag in 1777
Synonyms: June 14
(jargon)flag day - A software change that is neither forward- nor backward-compatible, and which is costly to make and costly to reverse. E.g. "Can we install that without causing a flag day for all users?"

This term has nothing to do with the use of the word flag to mean a variable that has two values. It came into use when a massive change was made to the Multics time-sharing system to convert from the old ASCII code to the new one; this was scheduled for Flag Day (a US holiday), June 14, 1966.

See also backward combatability, lock-in.
day, June, June 14
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flaccid bladder
flaccid paralysis
Flaccidity
Flacherie
flack
flack catcher
Flacker
Flacket
Flacon
Flacourtia
flacourtia family
Flacourtia indica
Flacourtiaceae
Flag
Flag broom
flag captain
-- Flag Day --
flag down
flag of truce
Flag of truse
flag officer
flag rank
Flag root
Flag share
flag smut
flag smut fungus
Flag station
flag stop
flag waving
flag-waver
flag-waving
Flagellant
Flagellata
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