Source : Webster's Revised Unabridged Dictionary (1913)

Variate \Va"ri*ate\, v. t. & i. [L. variatus, p. p. of variare.
   See {Vary}.]
   To alter; to make different; to vary.

Source : WordNet®

variate
     n : a variable quantity that is random [syn: {random variable},
         {variant}, {stochastic variable}, {chance variable}]