Theoretical (adjective)

1. Based on theory rather than on practical experience.
2. Relating to or involving the theoretical study of a subject.
3. Not practically possible or done.

Origin:

The word theoretical comes from the greek words "theōria" meaning view or contemplation and "logia" meaning study of.

Examples:

1. Theoretical physics is concerned with understanding the underlying principles of the universe.
2. The theoretical yield of a chemical reaction is the maximum amount of product that could be produced.
3. Theoretical models are used to predict behavior in complex systems.
4. The theoretical maximum weight that can be lifted is called one rep max.
5. Theoretical discussion is an important aspect of scientific research.