Webster's English Dictionary

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optimism

op.ti.mism \'a:p-t*-.miz-*m\ \-m*st\ \.a:p-t*-'mis-tik\ \-ti-k*l\ 
   \-k(*-)le-\ n [F optimisme, fr. L optimum, n., best, fr. neut. of optimus 
   b]est; akin to L ops power - more at OPULENT 1: a doctrine that this world 
   is the best possible world  2: an inclination to put the most favorable 
   construction upon actions and h appenings or to anticipate the best 
   possible outcome - op.ti.mist n