Why is the ninth month called September?
1540s, from French inciser (15c.), from Old French enciser (12c.), from Latin incisus, past participle of incidere "to cut into, cut through" (see incision). Related: Incised; incising.
incise in·cise (ĭn-sīz')v. in·cised, in·cis·ing, in·cis·es To cut into with a sharp instrument.