Meaning of centillion

cen•til•lion

Pronunciation: (sen-til'yun), [key]
— n., pl. adj. -lions, -lion,
—n.
  1. a cardinal number represented in the U.S. by 1 followed by 303 zeros, and in Great Britain by 1 followed by 600 zeros.
—adj.
  1. amounting to one centillion in number.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.