Why is the ninth month called September?
early 14c., from Middle French especialte, variant of specialite, from Latin specialitatem (nominative specialitas) "peculiarity," from specialis (see special). Speciality is attested from early 15c.; French form spécialité (especially in reference to restaurant dishes) is recorded from 1839.
specialty spe·cial·ty (spěsh'əl-tē)
A branch of medicine or surgery in which a physician specializes; the field or practice of a specialist.