American English

Definition of optimism noun from the Oxford Advanced American Dictionary

 

optimism

 noun
noun
NAmE//ˈɑptəˌmɪzəm//
 
[uncountable] optimism (about/for something)
 
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a feeling that good things will happen and that something will be successful; the tendency to have this feeling optimism about/for the future We may now look forward with optimism. a mood of cautious optimism There are very real grounds for optimism. Both sides have expressed optimism about the chances of an early agreement. opposite pessimism
See the Oxford Advanced Learner's Dictionary entry: optimism