|Origin:||Septembre, from Latin September, from septem 'seven'; because it was the seventh month of the ancient Roman year|
Sep‧tem‧ber [uncountable and countable] written abbreviation Sept.
the ninth month of the year, between August and October
I haven't heard from him since last September.
My birthday's in September.
on September 6th
The meeting will be on September 6th.
on 6th September British English
'When's the concert?' 'On 6th September.'
September 6 American English
They arrive September 6.