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Adjective: autumnal  o'túm-nul
  1. Of or characteristic of or occurring in autumn
    "the autumnal equinox"; "autumnal fruits"
     
  2. Characteristic of late maturity verging on decline
    "a serene autumnal mood"

See also: autumn-blooming, autumn-flowering, fall-blooming [N. Amer], fall-flowering [N. Amer], late-blooming, late-flowering, late-ripening, mature

Antonym: summery, vernal, wintery

Encyclopedia: Autumnal