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Look up theory in Wiktionary, the free dictionary.

Theory is speculative explanation, as opposed to practice or "just doing". Theory may also refer to:

• Theory (mathematics), a self-consistent body of definitions, axioms, theorems, examples, and so on
• Theory (mathematical logic), a set of sentences (theorems) in a formal language
• Scientific theory, a principle or body of principles for explaining a class of phenomena
• Philosophical theory, the collective statements underlying a philosophy, school of thought, or belief system
• Theoria in theological discussions
• Computational complexity theory in computer science
• Theory (clothing retailer)
• A type of argument in Policy debate and Lincoln-Douglas debate

See also

• All pages beginning with "Theory"
• All pages with titles containing "theory"

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