[sen-til-yuh
n] 
noun, plural -lions, (as after a numeral) -lion, adjective | 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. |
| 2. | amounting to one centillion in number. |
| cen·til·lion (sěn-tĭl'yən) n.
[Latin centum, hundred; see dek  in Indo-European roots + (m)illion.]cen·til'lion adj., cen·til'lionth adj., adv. & n. |