Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “September”


noun [C or U]     /sepˈtem.bər/ US  /-bɚ/ (written abbreviation Sept.)
A1 the ninth month of the year, after August and before October: My mother's birthday is in September. School starts on 3 September. Claudia is starting school next September.Names of months
(Definition of September noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of September

Definitions of “September” in other dictionaries

Word of the Day


a document given to students or reporters which contains information about a particular subject

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More