Specialty

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late Middle English (denoting the quality of being special or distinctive): from Old French especialite or late Latin specialitas, from Latin specialis (see special).

wiktionary

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From Old French specialte, especialte, from Latin specialitas.

etymonline

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specialty (n.)

c. 1300, "particular affection; special attachment or favor, partiality," from Old French especialte, more vernacular form of specialite (see speciality). Compare personalty/personality; realty/reality. From early 15c. as "unusual, or extraordinary thing; specialized branch of learning; peculiar quality, distinctive characteristic."