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The definition of theory

6 Definitions of: theory

1. noun, a system of rules, procedures, and assumptions used to produce a result
2. noun, abstract knowledge or reasoning
3. noun, a speculative or conjectural view or idea
4. noun, an ideal or hypothetical situation (esp in the phrase in theory)
5. noun, a set of hypotheses related by logical or mathematical arguments to explain and predict a wide variety of connected phenomena in general terms
6. noun, a nontechnical name for hypothesis
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1. noun, the theory that the earth and everything on it constitutes a single self-regulating living entity
2. Show me some examples of this word: theory
3. Show me the etymology of the word: theory

Synonyms:	belief, philosophy, surmise, system, science, ideology, hypothesis, plan, scheme, proposal	And more...
Antonyms:	fact

From Collins