The ninth month of the Gregorian calendar, following August and preceding October. Abbreviations: Sep or Sep., Sept or Sept.
"The garden is in full bloom during September, which comes right after August and before October."
The name September comes from the Latin word septem, meaning "seven," because it was originally the seventh month in the early Roman calendar. The word eventually traveled into English through Old French, where it was used to describe this specific month of the year.