continuing education
US /kənˌtɪn.ju.ɪŋ ed.ʒʊˈkeɪ.ʃən/
UK /kənˌtɪn.ju.ɪŋ ed.ʒʊˈkeɪ.ʃən/

1.
education provided for adults after they have left the formal education system, typically to improve their knowledge or skills in a particular area
:
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Many professionals enroll in continuing education courses to stay updated in their fields.
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She decided to pursue continuing education to earn a new certification.