Meaning of “specialize” - Learner’s Dictionary

specialize

verb [ I ] also UK -ise us uk /ˈspeʃəlaɪz/

B2 to spend most of your time studying one particular subject or doing one type of business:

She works for a company specializing in business law.
specialization noun [ U ] us uk /ˌspeʃəlaɪˈzeɪʃən/

(Definition of “specialize” from the Cambridge Learner’s Dictionary © Cambridge University Press)