theor-

1. A propostition that is not self-evident but that can be proven from accepted premises and so is establishe as a law or principle.
2. An idea that is demonstrably true or is assumed to be so.
3. In math and physics, a proposition embodying something to be proved.

1. Limited to or based on theory; not practical or applied; hypothetical
2. Tending to theorize; speculative.

1. A person who theorizes, especially one who specializes in the theory of some art, science, etc.
2. One who formulates, studies, or is an expert in the theory of a science or an art.

The theoretical part of a field of knowledge.

To form or propose a theory or theories about something; to speculate.

1. Originally, a mental viewing; contemplation.
2. A speculative idea or plan as to how something might be done.
3. A formulation of apparent relationships or underlying principles of certain observed phenomena which have been verified to some degree.
4. That branch of an art or science consisting in a knowledge of its principles and methods rather than in its practice; pure, as oppoed to applied, science, etc.
5. Theory implies considerable evidence in support of a formulated general principle explaining the operation of certain phenomena; as in the theory of evolution.
6. A belief that guides action or assists comprehension or judgment in some action.
7. An assumption based on limited information or knowledge; a conjecture.