September
noun
Sep·tem·ber sep-ˈtem-bər 
səp-
: the ninth month of the Gregorian calendar
Example Sentences
The weather has been very mild during the past two Septembers.
Word History
Etymology
Middle English Septembre, from Anglo-French & Old English, both from Latin September (seventh month), from septem seven — more at seven
First Known Use
before the 12th century, in the meaning defined above
Kids Definition
September
noun
Sep·tem·ber sep-ˈtem-bər
: the ninth month of the year