September

noun

Sep·​tem·​ber sep-ˈtem-bər 

səp-

: the ninth month of the Gregorian calendar

Examples of September in a Sentence

The weather has been very mild during the past two Septembers.

Recent Examples on the Web

For the six months ended September 2024, revenue jumped 14.2 percent year-over-year to 1 billion renminbi, or $136 million, while profit grew 20 percent to 115 million renminbi, or $15 million. —Denni Hu, WWD, 11 Feb. 2025

Apple introduced live photos in September 2015 with the release of the iPhone 6s. —Justin Gest, Newsweek, 11 Feb. 2025

Meanwhile, Amazon has challenged the constitutionality of the NLRB itself in a September federal lawsuit. —Greg Bensinger, USA TODAY, 11 Feb. 2025

Carpenter’s Short n’ Sweet Tour kicked off in September, with its North American leg ending in November. —Hannah Dailey, Billboard, 11 Feb. 2025

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 

səp-

: the ninth month of the year

Etymology

Middle English Septembre "the month of September," from Old English September and early French Septembre (both, same meaning), both from Latin September "the seventh month," from septem "seven"

Word Origin

The ancient Romans originally used a calendar which began the year with the month of March. The seventh month of the year was called September, from septem, a Latin word meaning "seven." The name was spelled Septembre when it was borrowed from early French into Middle English, but eventually the English spelling was changed to that of the original Latin.