use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments

find the solution to (a problem or question) or understand the meaning of

the capacity for rational thought or inference or discrimination

thinking that is coherent and logical

someone who reasons logically

substitute a natural for a supernatural explanation of

form or construct theories

construct a theory about

reason methodologically and logically

make a mathematical calculation or computation