Webster's English Dictionary

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module

mod.ule \'ma:j-(.)u:(*)l\ n [L modulus] 1: a standard or unit of 
   measurement  2: the size of some one part taken as a unit of measure by 
   which the propor tions of an architectural composition are regulated 3: a 
   usu. packaged functional assembly of wired electronic components for u se 
   with other such assemblies