September Definition

sĕp-tĕmbər
noun
The ninth month of the year, having 30 days.
Webster's New World
Synonyms:
septsepsummer monthopening of the football seasonback-to-school seasonharvestindian-summerautumn monthfall month
pronoun

The ninth month of the Gregorian calendar, following August and preceding October. Abbreviations: Sep or Sep., Sept or Sept.

Late September is a beautiful time of year.
This was one of the warmest Septembers on record.
Wiktionary

Other Word Forms of September

Noun

Singular:
september
Plural:
septembers

Origin of September

  • Late Old English, from Old French septembre, Latin september (“seventh month"), from septem (“seven"), from Proto-Indo-European *septḿ̥ (“seven"); September was the seventh month in the Roman calendar.

    From Wiktionary

  • Middle English Septembre from Old French from Latin September the seventh month from septem seven septm̥ in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

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