Source : Webster's Revised Unabridged Dictionary (1913)

Titan \Ti"tan\, a.
   Titanic.

         The Titan physical difficulties of his enterprise. --I.
                                                  Taylor.

Source : WordNet®

titan
     n 1: a person of exceptional importance and reputation [syn: {colossus},
           {behemoth}, {giant}, {heavyweight}]
     2: (Greek mythology) any of the primordial giant gods who ruled
        the Earth until overthrown by Zeus; the Titans were
        offspring of Uranus (Heaven) and Gaea (Earth)
     3: the largest of the satellites of Saturn; has a hazy nitrogen
        atmosphere