Sep ‧ tem ‧ ber /sepˈtembə $ -ər/ BrE AmE noun [uncountable and countable] ( written abbreviation Sept. )
[ Date: 1000-1100 ; Language: Old French ; Origin: Septembre , from Latin September , from septem 'seven' ; because it was the seventh month of the ancient Roman year ]
the ninth month of the year, between August and October
next/last September
I haven’t heard from him since last September.
in 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.