September
Americannoun
noun
Usage
What is September? September is the ninth month of the year in the Gregorian calendar. It has 30 days and is between August and October. In the Northern Hemisphere, September is known as the first month of the autumn season, while in the Southern Hemisphere, it’s the first month of the spring season. Much of the world celebrates International Workers Day in May, but in the United States and Canada, a similar celebration, called Labor Day, is held. It is celebrated on the first Monday of September. The Jewish holiday Rosh Hashanah, which marks the beginning of the year, is normally held in September. The holiday’s exact date changes because it is set according to the Hebrew calendar, which is based on the Moon’s cycle. Example: For many people, September is a calm month before the holidays in October, November, and December.
Other Word Forms
Derived Forms
Etymology
Origin of September
First recorded before 1050; Middle English Septembre, Old English, from Latin September “seventh month” in the early Roman calendar; for formation see December
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Nestlé divested Aimmune’s signature drug Palforzia in September 2023, about three years after buying the company for $2.6 billion.
From Barron's • Jun. 10, 2026
Early September would be a good time, too, since trading tends to pick up after summer is over.
From Barron's • Jun. 9, 2026
When SpaceX suffered an explosion in September 2016, it took 15 months to return to service - and SpaceX had other pads to fall back on.
From BBC • Jun. 9, 2026
His first concert at Lincoln Center as music director of the New York Philharmonic in September will open with Adams’ “On the Transmigration of Souls,” in commemoration of the 25th anniversary of 9/11.
From Los Angeles Times • Jun. 9, 2026
It took us into September, and the sands of time were running low.
From "The Teacher’s Funeral" by Richard Peck
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
