Noah Webster's Dictionary 1. (a.) Past the middle of a lifetime; pertaining to the fall season; as, autumnal fruits; autumnal plants. 2. (a.) Past the middle of life; in the third stage.

Multi-Version Concordance Autumnal (1 Occurrence) Jude 1:12 These are spots in your love-feasts, feasting together with you without fear, pasturing themselves; clouds without water, carried along by the winds; autumnal trees, without fruit, twice dead, rooted up; (DBY WBS YLT)