1. any statistical test of significance in which more than two conditions are compared simultaneously or in which there are two or more independent variables. The analysis of variance is an example. For instance, assume a researcher collects data from an experimental design having two independent variables, each of which has three different levels or conditions. He or she could conduct an analysis of variance to concurrently examine the mean values for all levels of each of the variables (and their combinations) in order to determine whether there are any significant differences among them.

2. a type of exam that simultaneously measures several different abilities. For example, a mathematics omnibus test may include items assessing numeracy, algebraic skills, geometric proficiency, and trigonometric competency.