the·o·ry ( P ) Pronunciation Key (th-r, thîr) n. pl. the·o·ries
1-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.
2-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.
3-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.
4-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.
5- An assumption based on limited information or knowledge; a conjecture.
It's good that you put in bold face the definition of 'theory' that is least relevant to the theory of evolution. Sometimes people get confused about such things.
Please explain your position of least relavent.