the ninth month of the year, containing 30 days. Abbreviation: Sept., Sep.

before 1050; Middle English Septembre, Old English < Latin September seventh month in the early Roman calendar; for formation see December

Septembral [sep-tem-bruhl] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
September (sɛpˈtɛmbə)
the ninth month of the year, consisting of 30 days
[Old English, from Latin: the seventh (month) according to the original calendar of ancient Rome, from septem seven]

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 O.E., from L. September, from septem "seven" (see seven). So called because it was the seventh month of the old Roman calendar, which began the year in March; Julian calendar reform (46 B.C.E.) shifted the new year back two months. For -ber suffix, see
December. Replaced O.E. hærfestmonað, haligmonað. Septembrist (1840) in Fr. history refers to the massacre of the political prisoners in Paris, Sept. 2-5, 1792.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


ninth month of the Gregorian calendar. Its name is derived from septem, Latin for "seven," an indication of its position in the early Roman calendar.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences for september
It is still held to this day, but earlier in the year at the beginning of september.
It hosts the twin falls county fair and rodeo every september.
After eighty days the government agreed to enter into talks in september.
There is an annual television festival in the last week in september.
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