I. post ‧ grad ‧ u ‧ ate 1 /ˌpəʊstˈɡrædjuət, ˌpəʊstˈɡrædjuɪt $ ˌpoʊstˈɡrædʒuət/ BrE AmE noun [countable] especially British English
someone who is studying at a university to get a MASTER’S DEGREE or a ↑ PhD SYN graduate student American English
II. postgraduate 2 BrE AmE adjective [only before noun]
1 . especially British English relating to studies done at a university after completing a first degree SYN graduate American English :
postgraduate degrees
2 . American English relating to studies done after completing a ↑ PhD SYN post doctoral