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Definition

optimism noun

/ˈɒp.tɪ.mɪ.zəm/US pronunciation symbol/ˈɑːp.tə-/ n [U]
being hopeful and emphasizing the good part of a situation rather than the bad part; the belief that good things will happen in the future
There was a note of optimism in his voice as he spoke about the company's future.
Judging from your examination results, I think you have cause/grounds/reason for cautious optimism about getting a university place.
Opposite: pessimism

(Definition of optimism noun from the Cambridge Advanced Learner's Dictionary)

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