trillionths

trillion

[tril-yuhn]
noun, plural trillions (as after a numeral) trillion.
1.
a cardinal number represented in the U.S. by 1 followed by 12 zeros, and in Great Britain by 1 followed by 18 zeros.
adjective
2.
amounting to one trillion in number.

Origin:
1680–90; < French, equivalent to tr(i)- tri- + (m)illion million

trillionth, noun, adjective
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World English Dictionary
trillion (ˈtrɪljən)
 
n
1.  the number represented as one followed by twelve zeros (1012); a million million
2.  (formerly, in Britain) the number represented as one followed by eighteen zeros (1018); a million million million
3.  (often plural) an exceptionally large but unspecified number
 
determiner (preceded by a or a numeral)
4.  a.  amounting to a trillion: a trillion stars
 b.  (as pronoun): there are three trillion
 
[C17: from French, on the model of million]
 
'trillionth
 
n, —adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

trillion
1690, from Fr. trillion (c.1484), from tri- + (m)illion. Cf. billion. In the U.S., the fourth power of a thousand (one thousand billion, 1 followed by 12 zeroes); in Great Britain, the third power of a million (one million billion, 1 followed by 18 zeroes), which is the original sense.
Online Etymology Dictionary, © 2010 Douglas Harper
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