Breadcrumb Home > Dictionary > Index F flag day: Meaning and Definition of Find definitions for: flag' day" Pronunciation: [key] — Brit. (sometimes caps.)Brit. See Flag' Day" Pronunciation: [key] 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. flag flagella TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: ennui Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language