an asset of special worth or utility
"cooking is his forte"
a distinguishing trait
"Her speciality is turning ordinary ingredients into gourmet dishes, which really sets her apart from other chefs in the city."
the special line of work you have adopted as your career
"his specialization is gastroenterology"
Britain standard form of specialty.
"After years of training, she decided to make fine chocolate her speciality in London's bustling market district."