1) Mathematical terminology 
In mathematics, univariate refers to an expression, equation, function or polynomial of only one variable. Objects of any of these types but involving more than one variable may be called multivariate. In some cases the distinction between the univariate and multivariate cases is fundamental; for example, the fundamental theorem of algebra and Euc...
A discrete choice model in which the choice is made from a one-dimensional set is said to be a univariate discrete choice model. Contexts: econometrics
(of a distribution) having one variate.