outcaste UK /ˈaʊtkɑːst/US /ˈaʊtkæst/noun 2verb 1forms 4 noun2 •An outcast from the caste system. •In caste-based societies, such as Indian or medieval Japan, an individual or group of people who do not belong to any officially recognized caste. verb1 •To expel from a caste. formsoutcasted · outcasteing · outcasting · outcastes