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optimist

[op-tuh-mist]
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noun
  1. an optimistic person.
  2. a person who holds the belief or the doctrine of optimism.
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Origin of optimist

1760–70; < French optimiste < Latin optim(um) (see optimum) + French -iste -ist
Related formsan·ti·op·ti·mist, noun, adjectiveo·ver·op·ti·mist, nounsu·per·op·ti·mist, noun
Can be confusedcynic optimist pessimist skeptic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for optimist

n.

1759, from French optimiste (1752); see optimism + -ist.

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Online Etymology Dictionary, © 2010 Douglas Harper