Billion Definition
 bĭlyən 
  billions
  
    noun
  
 
    billions
  
The cardinal number equal to 109 .
 American Heritage 
A thousand millions (1,000,000,000)
 Webster's New World 
The cardinal number equal to 1012 .
 American Heritage 
Trillion (a million millions)
Webster's New World 
An indefinitely large number.
 American Heritage 
    adjective
  
 Amounting to one billion in number.
 Webster's New World 
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