The Collaborative International Dictionary of English v.0.48:

Titan \Ti"tan\ (t[imac]"tan), a.
   Titanic.
   [1913 Webster]

         The Titan physical difficulties of his enterprise. --I.
                                                  Taylor.
   [1913 Webster]

WordNet (r) 3.0 (2006):

titan
    n 1: a person of exceptional importance and reputation [syn:
         colossus, behemoth, giant, heavyweight, titan]
    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