postgraduate(n = noun.person) grad student, graduate student - a student who continues studies after graduation;
is a kind of college boy, college man, collegian
Derived form adjective postgraduate₁

   postgraduate(s = adj.all) graduate - of or relating to studies beyond a bachelor's degree; "graduate courses"
Derived form noun postgraduate₁

   Of, pertaining to, or designating, the studies pursued after graduation, esp., after receiving the bachelor's degree at a college; graduate.
" Most careful writers consider the word graduate to be the proper word to use in this sense." [Webster 1913 Suppl.]

postgraduate, adj. & n.
--adj.
1 (of a course of study) carried on after taking a first degree.
2 of or relating to students following this course of study (postgraduate accommodation).
--n. a postgraduate student.