Definition of Quadrilion
Quad*ril"lion (?), n. [F., fr. L.
quater four times, akin to quattuor four, E.
four; -- formed like million. See Four,
Million.] According to the French notation, which is
followed also upon the Continent and in the United States, a unit with
fifteen ciphers annexed; according to the English notation, the number
produced by involving a million to the fourth power, or the number
represented by a unit with twenty-four ciphers annexed. See the Note
under Numeration.
- Webster's Unabridged Dictionary (1913)
- Usually it means a thousand thousand billion. That is to say, a 1 followed by fifteen zeros, 1015.
ISO prefix: peta-
- (Dated usage, notably British) A million trillion or a 1 followed by 21 zeros, 1024.
ISO prefix: yotta-
- The Nuttall Encyclopedia
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The correct Spelling of this word is: Quadrillion
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