A description of an event or system that is considered to be accurate.

Theoretically.

plural of theory

(mathematics) The study of iterative non-linear systems in which arbitrarily small variations in initial conditions become magnified over time.

(mathematics) A branch of topology dealing with knots.

(mathematics) The branch of pure mathematics concerned with the properties of integers.

(physics) A supposed theory uniting all fundamental physical phenomena into a single framework.

(mathematics) The mathematical theory of sets. / (music) Musical set theory, a systematic approach to describing musical objects and their relationships.

(mathematics) The mathematical study of probability (the likelihood of occurrence of random events in order to predict the behavior of defined systems).

(sociology) Any of various models of group behavior (such as economic behavior, criminal behavior, or consumer behavior) as the cumulative result of rational choices made by individuals expressing on their preferences and/or meeting their needs.