Webster's English Dictionary

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quadruple

1. qua.dru.ple \kwa:-'dru:p-*l, -'dr*p-; 'kwa:d-r*p-\ \-(*-)lin\ vb or 
   qua.dru.pling : to make four times as great or as many  : to become four 
   times as great or as numerous 
2. quadruple aj [MF or L; MF, fr. L quadruplus, fr. quadri- + -plus 
   multiplie]d by - more at DOUBLE 1: having four units or members  2: being 
   four times as great or as many  3: marked by four beats per measure {~ 
   meter}  - quadruple n