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[sep-tem-ber] /sɛpˈtɛm bər/
the ninth month of the year, containing 30 days.
Abbreviation: Sept., Sep.
Origin of September
before 1050; Middle English Septembre, Old English < Latin September seventh month in the early Roman calendar; for formation see December
Related forms
[sep-tem-bruh l] /sɛpˈtɛm brəl/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for September


the ninth month of the year, consisting of 30 days
Word Origin
Old English, from Latin: the seventh (month) according to the original calendar of ancient Rome, from septem seven
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for September

late Old English, from Latin September (also source of Old French Septembre, Spanish Setiembre, Italian Settembre, German 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 Old English hærfestmonað, haligmonað. Related: Septembral.

Online Etymology Dictionary, © 2010 Douglas Harper
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