theory
noun pl. theories
- Obsolete a mental viewing; contemplation
- a speculative idea or plan as to how something might be done
- a systematic statement of principles involved: the theory of equations in mathematics
- a formulation of apparent relationships or underlying principles of certain observed phenomena which has been verified to some degree
- that branch of an art or science consisting in a knowledge of its principles and methods rather than in its practice; pure, as opposed to applied, science, etc.
- popularly a mere conjecture, or guess
See theory in American Heritage Dictionary 4
(thēˈə-rē, thîrˈē)
noun pl. the·o·ries - A set of statements or principles devised to explain a group of facts or phenomena, especially one that has been repeatedly tested or is widely accepted and can be used to make predictions about natural phenomena.
- The branch of a science or art consisting of its explanatory statements, accepted principles, and methods of analysis, as opposed to practice: a fine musician who had never studied theory.
- A set of theorems that constitute a systematic view of a branch of mathematics.
- Abstract reasoning; speculation: a decision based on experience rather than theory.
- A belief or principle that guides action or assists comprehension or judgment: staked out the house on the theory that criminals usually return to the scene of the crime.
- An assumption based on limited information or knowledge; a conjecture.
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