Merriam-Webster's Collegiate Dictionary
post·grad·u·ate \\ˌpōs(t)-ˈgra-jə-wət, -ˌwāt, -ˈgraj-wət\\ adjective DATE 1858
: of, relating to, or engaged in formal studies after graduation
: graduate
noun DATE circa 1890
: a student continuing formal education after graduation from high school or college
post-graduate
post-graduate (adj.) 1858, originally Amer.Eng., from post- + graduate (adj.). As a noun, attested from 1890. Abbreviation post-grad is recorded from 1950.
Oxford Advanced Learner's Dictionary-牛津双解-OALD7
postgraduatepost·gradu·ate /
7pEust5^rAdVuEt;
NAmE 7poust- / (also informal
post·grad /
5pEust^rAd;
NAmE 5poust- / )
noun (especially BrE) a person who already holds a first degree and who is doing advanced study or research; a
graduate
student
研究生:
postgraduate students 研究生
a postgraduate course 研究生课程⇨ note at
student
Webster's Third New International Dictionary, Unabridged
post·graduateI. \(ˈ) ̷ ̷+\
adjectiveEtymology: post- + graduate1. : graduate
1b
2. : of, relating to, or engaged in study following graduation from high school usually concentrating on preparation for college entrance
II. noun : a student continuing his education after graduation from high school or college