/ Dictionary / Index F Fort Jefferson: Meaning and Definition of Find definitions for: Fort" Jef'ferson Pronunciation: [key] a national monument in Dry Tortugas, Fla.: a federal prison 1863–73; now a marine museum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Fort Jackson Fort Kearney Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language