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

Antisemitic incidents in the United States hit a record high in the 12-month period from October 2023 to September 2024, the ADL reported last month. —Jessica Guynn, USA Today, 9 May 2025

August grief, September suicide prevention, October stress, November anxiety and December anger—a full calendar year of mental health topics. —Katherine Fung, MSNBC Newsweek, 9 May 2025

On September 19, 2023, Instacart's IPO priced at $30, raised $660 million, and closed up 12% on its first day. —Kiri Masters, Forbes.com, 8 May 2025

The daily chart of COIN features a cyclical pattern from a low in September around $150 to an early December peak at $350. —David Keller, CNBC, 8 May 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

Rhymes for September

• december
• dismember
• nonmember
• november
• remember
• ember
• member

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.