资料来源 : pyDict

秋的,秋天的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Autumnal \Au*tum"nal\, a. [L. auctumnalis, autumnalis: cf. F.
   automnal.]
   1. Of, belonging to, or peculiar to, autumn; as, an autumnal
      tint; produced or gathered in autumn; as, autumnal fruits;
      flowering in autumn; as, an autumnal plant.

            Thick as autumnal leaves that strow the brooks In
            Vallombrosa.                          --Milton.

   2. Past the middle of life; in the third stage.

            An autumnal matron.                   --Hawthorne.

   {Autumnal equinox}, the time when the sun crosses the
      equator, as it proceeds southward, or when it passes the
      autumnal point.

   {Autumnal point}, the point of the equator intersected by the
      ecliptic, as the sun proceeds southward; the first point
      of Libra.

   {Autumnal signs}, the signs Libra, Scorpio, and Sagittarius,
      through which the sun passes between the autumnal equinox
      and winter solstice.

资料来源 : WordNet®

autumnal
     adj 1: of or characteristic of or occurring in autumn; "the
            autumnal equinox"; "autumnal fruits" [ant: {wintry}, {vernal},
             {summery}]
     2: characteristic of late maturity verging on decline; "a
        serene autumnal mood"