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optimism noun

  /ˈɑptɪmɪzəm/ , /ˈɒptɪmɪzəm/
  • a tendency to expect the best, or at least, a favourable outcome
 optimismus

optimal adjective

  /ˈɑptɪməl/ , /ˈɒptɪməl/
  • The best, most favourable or desirable, especially under some restriction.
 optimus
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