semivegetarian UK /ˌsɛmiˌvɛd͡ʒɪˈtɛəɹi.ən/US /ˌsɛmiˌvɛd͡ʒɪˈtɛɹi.ən/adjective 2noun 2forms 1 adjective2 •Being a semivegetarian (in either sense). •Fit for a semivegetarian to eat; that is, not containing certain kinds of flesh. noun2 •One who does not eat certain kinds of flesh (often red meat). •One who does not eat very much flesh. formssemivegetarians