specialization

US /ˌspeʃ.ə.ləˈzeɪ.ʃən/
UK /ˌspeʃ.ə.ləˈzeɪ.ʃən/
1.

Spezialisierung

a particular area of knowledge or the process of becoming an expert in a particular area:

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Specialization (= limiting study or work to one particular area) usually doesn't occur until PhD level.
:
specialspecializedspeciallyspecializespecialityspecial effectsspecial school