/ Dictionary / Index F four-o'clock: Meaning and Definition of Find definitions for: four-o'clock Pronunciation: (fôr'u-klok", fōr'-), [key] — n. a common garden plant, Mirabilis jalapa, of the four-o'clock family, having tubular red, white, yellow, or variegated flowers that open late in the afternoon. any plant of the same genus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: four-o'clock (Thesaurus) Four Noble Truths four-o'clock family Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language