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specialize  (specializes 3rd person present) (specializing present participle) (specialized past tense & past participle )
in BRIT, also use  specialise  If you specialize in a thing, you know a lot about it and concentrate a great deal of your time and energy on it, especially in your work or when you are studying or training. You also use specialize to talk about a restaurant which concentrates on a particular type of food.  verb 
...a University professor who specializes in the history of the Russian empire.  V in n 
...a Portuguese restaurant which specializes in seafood.  V in n 
 specialization    (specializations plural) n-var 
This degree offers a major specialisation in Social Policy alongside a course in Sociology.