the season between summer and winter; fall. In the Northern Hemisphere it is from the September equinox to the December solstice; in the Southern Hemisphere it is from the March equinox to the June solstice.
a time of full maturity, especially the late stages of full maturity or, sometimes, the early stages of decline: to be in the autumn of one's life.

1325–75; < Latin autumnus; replacing Middle English autumpne < Middle French autompne < Latin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
autumn (ˈɔːtəm)
1.  (sometimes capital)
 a.  Also called (esp US): fall the season of the year between summer and winter, astronomically from the September equinox to the December solstice in the N hemisphere and from the March equinox to the June solstice in the S hemisphere
 b.  (as modifier): autumn leaves
2.  a period of late maturity, esp one followed by a decline
[C14: from Latin autumnus, perhaps of Etruscan origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from O.Fr. autumpne, from L. autumnus (also auctumnus, perhaps infl. by auctus "increase"), a word probably of Etruscan origin. But Tucker suggests a meaning "drying-up season" and a root in *auq- (which would suggest the form in -c- was the original) and compares archaic Eng. sere-month "August."
Harvest was the Eng. name for the season until autumn began to displace it 16c. In Britain, the season is popularly August through October; in U.S., September through November. Cf. It. autunno, Sp. otoño, Port. outono, all from the Latin word. Unlike the other three seasons, its names across the IE languages leave no evidence that there ever was a common word for it. Many "autumn words mean "end, end of summer," or "harvest." Cf. also Lith. ruduo "autumn," from rudas "reddish," in ref. to leaves; O.Ir. fogamar, lit. "under-winter."
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


season of the year between summer and winter during which temperatures gradually decrease. It is often called fall in the United States because leaves fall from the trees at that time. Autumn is usually defined in the Northern Hemisphere as the period between the autumnal equinox (day and night equal in length), September 22 or 23, and the winter solstice (year's shortest day), December 21 or 22; and in the Southern Hemisphere as the period between March 20 or 21 and June 21 or 22. The autumn temperature transition between summer heat and winter cold occurs only in middle and high latitudes; in equatorial regions, temperatures generally vary little during the year. In the polar regions autumn is very short. For physical causes of the seasons, see season.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The needles turn yellow and fall in the late autumn, leaving the trees leafless
  through the winter.
In cold climates, plant in early spring for green shoots in summer, bulbs in
The summer deadline, set when talks began in earnest last autumn, is near.
Harvest season from late summer to early autumn is especially recommended, when
  roadside stands sell local produce.
Images for autumn
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