postgraduate
US /ˌpoʊstˈɡrædʒ.u.ət/
UK /ˌpoʊstˈɡrædʒ.u.ət/

1.
a person who is studying for a higher degree after having already got a first degree
:
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She is a postgraduate student researching artificial intelligence.
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Many postgraduates struggle with funding their studies.
1.
relating to studies done after receiving a first degree
:
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She is pursuing a postgraduate degree in law.
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The university offers various postgraduate programs.