I. Greek 1 /ɡriːk/ BrE AmE adjective
relating to Greece, its people, or its language:
Greek yoghurt
II. Greek 2 BrE AmE noun
[ Date: 800-900 ; Language: Latin ; Origin: Graecus , from Greek Graikos ]
1 . [countable] someone from Greece
2 . [uncountable] the language used in modern or ancient Greece
3 . [countable] American English a member of a ↑ sorority or ↑ fraternity at an American college or university
4 . it’s all Greek to me informal used to say that you cannot understand something