Because September used to be the seventh month of the old Roman calendar. In Latin, septimus means "seventh".
Sept or hept
September. it uses the prefix 'Sept,' Latin for seven, as it was at one point the seventh month in the year. And Septagon is not a word in the English language. The correct name for a 7-sided polygon is "heptagon." It is derived from "hepta," the Greek word for "seven."
"ian' is not a prefix. A prefix is at the start of a word.
The root word sept means seven. This is shown in septet and septennial.
sept is the Latin word for seven and September was seventh in the Latin calendar
No, a prefix is a word that goes on the start of a word e.g. pre- in preschool
I think it is a word root, not a prefix.
"Second-hand" is a word that starts with the prefix "se-".
prefix
prefix
terrain
A prefix