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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 qua·dril·lion /kwɑˈdrɪljən/
 百萬之四次方

From: Webster's Revised Unabridged Dictionary (1913)

 Quad·ril·lion n.  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.
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From: WordNet (r) 2.0

 quadrillion
      n 1: the number that is represented as a one followed by 24
           zeros; "in England they call a septillion a quadrillion"
      2: the number that is represented as a one followed by 15 zeros