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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.