Английский разговорный словарь (основной) - optimism

ˈɔptɪmɪzm n. 1 an inclination to hopefulness and confidence (opp. PESSIMISM). 2 Philos. a the doctrine, esp. as set forth by Leibniz, that this world is the best of all possible worlds. b the theory that good must ultimately prevail over evil in the universe. øøoptimist n. optimistic adj. optimistically adv. [F optimisme f. L OPTIMUM]