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English definition of “optimist”

optimist

noun [C] uk   /ˈɒp.tɪ.mɪst/ us    /ˈɑːp.tə-/
C1 someone who always believes that good things will happen: She's a born optimist (= someone who has always been optimistic).
(Definition of optimist from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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