Definition: optimist

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Source: WordNet (r) 1.7 

optimist
     n : a person disposed to take a favorable view of things [ant: pessimist]

Source: Webster's Revised Unabridged Dictionary (1913) 

Optimist \Op"ti*mist\, n. [Cf. F. optimiste.]
   1. (Metaph.) One who holds the opinion that all events are
      ordered for the best.

   2. One who looks on the bright side of things, or takes
      hopeful views; -- opposed to pessimist.

Source: THE DEVIL'S DICTIONARY ((C)1911 Released April 15 1993) 

OPTIMIST, n.  A proponent of the doctrine that black is white.
    A pessimist applied to God for relief.
    "Ah, you wish me to restore your hope and cheerfulness," said God.
    "No," replied the petitioner, "I wish you to create something that
would justify them."
    "The world is all created," said God, "but you have overlooked
something -- the mortality of the optimist."