Etymology
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autumnal (adj.)

1570s, "maturing or blooming in autumn;" 1630s, "belonging to autumn," from Latin autumnalis "pertaining to autumn," from autumnus (see autumn). From 1650s in figurative sense "past the prime."

updated on March 06, 2017

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Definitions of autumnal from WordNet

autumnal (adj.)
of or characteristic of or occurring in autumn;
autumnal fruits
the autumnal equinox
autumnal (adj.)
characteristic of late maturity verging on decline;
a serene autumnal mood
From wordnet.princeton.edu, not affiliated with etymonline.