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English definition of “optimism”

optimism

noun [U]     /ˈɒp.tɪ.mɪ.zəm/ US  /ˈɑːp.tə-/
C2 the quality of being full of hope and emphasizing the good parts of a situation, or a belief that something good will happen: There was a note of optimism in his voice as he spoke about the company's future. Judging from your exam results, I think you have cause/grounds/reason for cautious optimism about getting a university place. → Opposite pessimismHoping and hopefulnessPotential
(Definition of optimism noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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