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Meaning of flag day

flag' day"

Pronunciation: [key]
— Brit. (sometimes caps.)Brit.
  1. See

Flag' Day"

Pronunciation: [key]
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.