[mod.u.lus] n, pl -li [NL, fr. L, small measure] (1753) 1 a: the factor by which a logarithm of a number to one base is multiplied to obtain the logarithm of the number to a new base b: absolute value
2. c (1): the number (as a positive integer) or other mathematical entity (as a polynomial) in a congruence that divides the difference of the two congruent members without leaving a remainder--compare residue b (2): the number of different numbers used in a system of modular arithmetic
2: a constant or coefficient that expresses usu. numerically the degree to which a body or substance possesses a particular property (as elasticity)