a quantity that takes any of a set of values with specified probabilities.
Origin of random variable
First recorded in 1935–40
Also called variate.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for random variable
statistics a quantity that may take any of a range of values, either continuous or discrete, which cannot be predicted with certainty but only described probabilisticallyAbbreviation: rv
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012