decillionth

de·cil·lionth

 (dĭ-sĭl′yənth)
n.
1. The ordinal number matching the number decillion in a series.
2. One of a decillion equal parts.
de·cil′lionth adv. & adj.
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.
References in periodicals archive ?
SECOND = Sixty-Eight Centillion One Ninety Decillionth & Seventy-Eight Centillion One Ninety Duodecillionth.
Extreme number names
Extraordinary flatness means the universe experienced relatively prolonged inflation, up to a decillionth of a second or more, immediately after the big bang.
Universe Measured to One-Percent Accuracy
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