Source : Webster's Revised Unabridged Dictionary (1913)

Buddha \Bud"dha\, n. [Skr. buddha wise, sage, fr. budh to know.]
   The title of an incarnation of self-abnegation, virtue, and
   wisdom, or a deified religious teacher of the Buddhists, esp.
   Gautama Siddartha or Sakya Sinha (or Muni), the founder of
   Buddhism.

Source : WordNet®

Buddha
     n 1: founder of Buddhism; worshipped as a god (c 563-483 BC)
          [syn: {the Buddha}, {Siddhartha}, {Gautama}, {Gautama
          Siddhartha}, {Gautama Buddha}]
     2: one who has achieved a state of perfect enlightenment