Definition of optimist noun from the Oxford Advanced Learner's Dictionary

 

optimist

 noun
noun
BrE BrE//ˈɒptɪmɪst//
 
; NAmE NAmE//ˈɑːptɪmɪst//
 
 
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a person who always expects good things to happen or things to be successful He’s an incurable optimist. Pete, ever the optimist, said things were bound to improve. opposite pessimist
See the Oxford Advanced American Dictionary entry: optimist