purist UK /ˈpjʊəɹɪst/US /ˈpjʊɹ.ɪst/adjective 1noun 1forms 3 adjective1 •Of or pertaining to purism.He was the first to play for money, a practice which got him ousted from the purist U.S. Lawn Tennis Association. — 1976 noun1 •An advocate of purism. formspurists · more purist · most purist