centillionth

cen·til·lion

 (sĕn-tĭl′yən)
n.
1. The cardinal number equal to 10303.
2. Chiefly British The cardinal number equal to 10600.

[Latin centum, hundred; see dekm̥ in Indo-European roots + (m)illion.]

cen·til′lion adj.
cen·til′lionth adj.adv. & n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

centillionth

(sɛnˈtɪljənθ)
n
(in Britain and Germany) a number equal to 10–600(in the US, Canada, and France) a number equal to 10–303
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Highest making phrases: Cardinal: centillion (Ill, not nice.); Ordinal: centillionth (I'll con it then.).