/ Dictionary / Index A autumnal: Meaning and Definition of Find definitions for: au•tum•nal Pronunciation: (ô-tum'nl), [key] — adj. belonging to or suggestive of autumn; produced or gathered in autumn: autumnal colors. past maturity or middle life. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: autumnal (Thesaurus) autumn autumnal equinox Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language