The Collaborative International Dictionary of English v.0.48:

Autobiography \Au`to*bi*og"ra*phy\, n.; pl. Autobiographies.
   [Auto- + biography.]
   A biography written by the subject of it; memoirs of one's
   life written by one's self.
   [1913 Webster] Autocarpous

WordNet (r) 3.0 (2006):

autobiography
    n 1: a biography of yourself

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "autobiography":
   Clio, Muse of history, adventures, annals, biographical sketch,
   biography, case history, chronicle, chronicles, chronology,
   confessions, curriculum vitae, diary, experiences, fortunes,
   hagiography, hagiology, historiography, history, journal, legend,
   letters, life, life and letters, life story, martyrology, memoir,
   memoirs, memorabilia, memorial, memorials, necrology, obituary,
   photobiography, profile, record, resume, story,
   theory of history