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From The Collaborative International Dictionary of English v.0.48:
Optimist \Op"ti*mist\, n. [Cf. F. optimiste.] [1913 Webster] 1. (Metaph.) One who holds the opinion that all events are ordered for the best. [1913 Webster] 2. One who looks on the bright side of things, or takes hopeful views; one who experiences optimism; -- opposed to pessimist. [1913 Webster]