September has “seven” hidden in its name, even though it is our ninth month. The name comes from Latin September, which is derived from septem, meaning “seven.” It reflects an early Roman calendar in which March was the first month.
Counting from March makes the connection clear: March was first, April second, May third, June fourth, July fifth, August sixth, and September seventh. The name made sense within that calendar’s order.
In the modern calendar, we start counting with January instead. That puts September in ninth place. The old name stayed, even though its position changed. So the claim that it “literally means seventh month” is a useful shortcut for its history, not a description of its position today.
Compare these two statements:
- In an early Roman calendar, September was the seventh month.
- In today’s calendar, September is the ninth month.
Both are correct because they refer to different ways of ordering the year.
For everyday English, use the month name normally: Our classes begin in September. You do not need to think about the Latin root when making plans or writing dates. If someone asks you to write the month as a number on a modern form, use 9, not 7. The word’s history explains its spelling, but the calendar you use determines its number.