Open English Wordnet
Nouns
(n)specialization, specialisation, differentiation(biology) the structural adaptation of some body part for a particular function“cell differentiation in the developing embryo”
(n)specialization, specialisationthe act of specializing; making something suitable for a special purpose
(n)specialization, specialisation, specialty, speciality, specialismthe special line of work you have adopted as your career“his specialization is gastroenterology”