n. 1. the set of values that a given function takes as its argument varies through its domain; the image of the domain. This must be a subset of, but may or may not be identical with the codomain.2. the set of values that a given variable can take in an equation, identity, etc., that is, for which the expression is defined. 3. (of points) all points on a given line. 4. the set of objects, values, etc. that are relevant to the truth conditions of a closed sentence. See quantifier, interpretation.5. (Statistics) a measure of dispersion obtained as the absolute difference between the smallest and largest values of a variable in a sample.