spe·cial·ism 
/ˈspɛʃəˌlɪzəm/ noun
plural spe·cial·isms /ˈspɛʃəˌlɪzəm/ noun [count] Brit : a particular subject or area of study or practice
▪ The professor's specialism [=specialty] is labor law. — often + in ▪ a doctor whose specialism [=specialty, specialization] is in blood disorders [=a doctor who specializes in blood disorders] ▪ an accounting firm with a specialism in corporate mergers
▪ The professor's specialism [=specialty] is labor law. — often + in ▪ a doctor whose specialism [=specialty, specialization] is in blood disorders [=a doctor who specializes in blood disorders] ▪ an accounting firm with a specialism in corporate mergers
