Webster's English Dictionary

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modulus

mod.u.lus \'ma:j-*-l*s\ \-*-.li-, -.le-\ n or mod.u.li [NL, fr. L, small 
   measure] pl  1: a constant or coefficient that expresses numerically the 
   degree in which  a property is possessed by a substance or body 2a: 
   ABSOLUTE VALUE  2b: an integer that when divided into the difference of two 
   numbers leaves  no remainder 2c: the factor by which a logarithm of a 
   number to one base is multiplied t o obtain the logarithm of the number to 
   a new base