Definition: autumn

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Source: WordNet (r) 1.7 

autumn
     adj : occurring in or appropriate to the season of autumn; "autumn
           leaves" [syn: autumn]
     n : the season when the leaves fall from the trees; "in the fall
         of 1973" [syn: fall]

Source: Webster's Revised Unabridged Dictionary (1913) 

Autumn \Au"tumn\, n. [L. auctumnus, autumnus, perh. fr. a root
   av to satisfy one's self: cf. F. automne. See Avarice.]
   1. The third season of the year, or the season between summer
      and winter, often called ``the fall.'' Astronomically, it
      begins in the northern temperate zone at the autumnal
      equinox, about September 23, and ends at the winter
      solstice, about December 23; but in popular language,
      autumn, in America, comprises September, October, and
      November.

   Note: In England, according to Johnson, autumn popularly
         comprises August, September, and October. In the
         southern hemisphere, the autumn corresponds to our
         spring.

   2. The harvest or fruits of autumn. --Milton.

   3. The time of maturity or decline; latter portion; third
      stage.

            Dr. Preston was now entering into the autumn of the
            duke's favor.                         --Fuller.

            Life's autumn past, I stand on winter's verge.
                                                  --Wordsworth.