September is a noun and defined as the ninth month of the Gregorian calendar. First used around the 12th century, September is one of the many words in the English language that has its roots in Latin. Historical names for September include the Anglo-Saxon word Hāligmonath or “holy month” because religious festivals would occur to celebrate the bountiful summer crop.
Today, the most widely used calendar is the Gregorian calendar. Introduced by Pope Gregory XIII in 1582, the Gregorian calendar can be traced back to the Roman calendar, which consisted of 10 months and a dead period during winter. The original 10 months were Martius, Aprilis, Maius, Junius, Quintilis, Sextilis, September, October, November, and December. September was named after the Latin word for seven, septem, because it was originally the seventh month in the early Roman calendar. It wasn’t until 450 BC when January officially became the first month of the calendar year and September was pushed from the seventh to ninth month.
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Sources
“September.” Merriam-Webster.com
https://www.almanac.com/content/how-did-months-get-their-names
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