/ Dictionary / Index J Jefferson Day: Meaning and Definition of Find definitions for: Jef'ferson Day" Pronunciation: [key] April 13, Thomas Jefferson's birthday, a legal holiday in Alabama, sometimes celebrated by the Democratic party by the holding of fund-raising dinners. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Jefferson Davis's Birthday Jeffersonian Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language