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The season of the year between summer and winter, lasting from the autumnal equinox to the winter solstice and from September to December in the Northern Hemisphere; fall.
(noun)
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A period of maturity verging on decline.
(noun)
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Of, having to do with, occurring in, or appropriate to the season of autumn: autumn foliage; autumn harvests.
(adjective)
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Grown during the season of autumn: autumn crops.
(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.