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

Theoretically.

plural of theory

Used other than figuratively or idiomatically: see group, theory; a theory about (particular kinds of) groups.

(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.

Any theory attempting to explain the process by which individuals explain the causes of behaviour and events.

(mathematics) A branch of topology dealing with knots.

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

(uncountable, mathematics) The branch of mathematics dealing with the properties of graphs (networks of vertices and edges).

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