September
sep-TEM-bur/sɛpˈtɛmbɚ/UKsep-TEM-buh/sɛpˈtɛmbə/
- 1The ninth month of the Gregorian calendar, falling between August and October and containing the southward equinox.
The new academic year begins in September across most of the country.
September brought cooler evenings and the first hint of fall.
UsageTakes a capital letter. Use in September, but on with a date: on September 5.
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Origin
September comes through Middle English and Old French septembre from Latin September, meaning "seventh month," built on septem ("seven"), which traces back to Proto-Indo-European *septḿ̥; how the rest of the word was formed is uncertain. It was the seventh month in the Roman calendar.