Duodecillion Definition
 do͝oō-dĭ-sĭlyən, dyo͝o- 
    noun
  
 The cardinal number equal to 1039 .
 American Heritage 
The cardinal number equal to 1072 .
 American Heritage 
Origin of Duodecillion
-  Latin duodecim twelve duodecimal (m)illion From American Heritage Dictionary of the English Language, 5th Edition 
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