octillion

octillion

[ok-til-yuhn]
noun, plural octillions (as after a numeral) octillion.
1.
a cardinal number represented in the U.S. by 1 followed by 27 zeros, and in Great Britain by 1 followed by 48 zeros.
adjective
2.
amounting to one octillion in number.

Origin:
1680–90; < French, equivalent to oct- oct- + -illion, as in million

octillionth, noun, adjective
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World English Dictionary
octillion (ɒkˈtɪljən)
 
n
1.  (in Britain and Germany) the number represented as one followed by 48 zeros (1048)
2.  (in the US, Canada, and France) the number represented as one followed by 27 zeros (1027)
 
[C17: from French, on the model of million]
 
oc'tillionth
 
adj

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