Meaning of undecillion

un•de•cil•lion

Pronunciation: (un"di-sil'yun), [key]
— n., pl. adj. -lions, -lion,
—n.
  1. a cardinal number represented in the U.S. by 1 followed by 36 zeros, and in Great Britain by 1 followed by 66 zeros.
—adj.
  1. amounting to one undecillion in number.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.