September | Webster's Dictionary of the English Language

September
September, bris, m. [septem; as, October, Novem-ber, Decem-ber; cf. Varr. L. L. 6, § 34 Müll.], the ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
September
September bris, m septem, of seven, seventh : mense Septembri, in the seventh month (from March)....

An Elementary Latin Dictionary