flag day

Dictionary.com Unabridged

Flag Day

noun
June 14, the anniversary of the day (June 14, 1777) when Congress adopted the Stars and Stripes as the national flag of the United States.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
flag day
 
n
(Brit) a day on which money is collected by a charity and small flags, emblems, or stickers are given to contributors

Flag Day
 
n
June 14, the annual holiday in the US to celebrate the adoption in 1777 of the Stars and Stripes

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Slang Dictionary

flag day

n. A software change that is neither forward- nor backward-compatible, and which is costly to make and costly to reverse. "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 timesharing system to convert from the short-lived 1965 version of the ASCII code to the 1967 version (in draft at the time); this was scheduled for Flag Day (a U.S. holiday), June 14, 1966. See also backward combatability.
FOLDOC
Computing Dictionary

flag day definition

jargon
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.
[Jargon File]
(1998-01-15)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Encyclopedia Britannica
Encyclopedia

flag day

in the United States, a day honouring the national flag, observed on June 14. The holiday commemorates the date in 1777 when the United States approved the design for its first national flag

Learn more about Flag Day with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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