September is derived from the Latin word 'September' meaning 'seventh month'. It is the ninth month of the year in the Gregorian calendar. In the northern hemisphere, this month is usually regarded as the first month of autumn. September comes before November and after August.
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what does september mean
the ninth month of the year, containing 30 days. Abbreviation: Sept., Sep.
In mathematics and statistics, the arithmetic mean , or simply the mean or average when the context is clear, is the sum of a collection of numbers divided by the number of numbers in the collection....