Specialty

noun, plural specialties.
1.
a special or distinctive quality, mark, state, or condition.
2.
a special subject of study, line of work, area of interest, or the like:
His specialty is art criticism.
3.
an article or service particularly dealt in, rendered, manufactured, etc., or one to which the provider, dealer, or manufacturer claims to devote special care:
The manufacturer’s specialty is fine hats.
4.
an article of unusual or superior design or quality.
5.
a novelty; a new article.
6.
an article with such strong consumer demand that it is at least partially removed from price competition.
7.
a special or particular point, item, matter, characteristic, or peculiarity.
8.
Law.

a special agreement, contract, etc., expressed in an instrument under seal.
a negotiable instrument not under seal.

adjective
9.
Theater.

performing or performed in a manner that is unusual or not customary for a type of act, especially a performance involving dexterity or ingenuity, as a patter song:
specialty actor; specialty act.
(of a song or dance) isolated from the rest of the show:
specialty number.

noun (pl) -ties
1.
(law) a formal contract or obligation expressed in a deed
2.
(US & Canadian) a special interest or skill
3.

a service or product specialized in, as at a restaurant: roast beef was a specialty of the house
(as modifier): a specialty dish

4.
a special or distinguishing feature or characteristic

specialty spe·cial·ty (spěsh’əl-tē)
n.
A branch of medicine or surgery in which a physician specializes; the field or practice of a specialist.