Quadrillion definitions

kwŏ-drĭl'yən
The cardinal number equal to 1015 .
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The cardinal number equal to 1024 .
noun
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The number represented by 1 followed by 15 zeros.
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The number represented by 1 followed by 24 zeros.
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Amounting to one quadrillion in number.
adjective
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One thousand times one trillion, which is 1, followed by 15 zeros, or 10 to the 15th power. See space/time.
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(figuratively, slang) Any very large number, exceeding normal description.
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Origin of quadrillion

quadr(i)– (m)illion