Available Definitions:
1) n. - The act or process of adducing a reason or reasons; manner of presenting one's reasons.
2) n. - That which is offered in argument; proofs or reasons when arranged and developed; course of argument.
3) n. - Due exercise of the reasoning faculty; accordance with, or that which is accordant with and ratified by, the mind rightly exercised; right intellectual judgment; clear and fair deductions from true principles; that which is dictated or supported by the common sense of mankind; right conduct; right; propriety; justice.
4) n. - Ratio; proportion.
5) n. - To exercise the rational faculty; to deduce inferences from premises; to perform the process of deduction or of induction; to ratiocinate; to reach conclusions by a systematic comparison of facts.
6) n. - Hence: To carry on a process of deduction or of induction, in order to convince or to confute; to formulate and set forth propositions and the inferences from them; to argue.
7) n. - To converse; to compare opinions.
8) v. t. - To arrange and present the reasons for or against; to examine or discuss by arguments; to debate or discuss; as, I reasoned the matter with my friend.
9) v. t. - To support with reasons, as a request.
10) v. t. - To persuade by reasoning or argument; as, to reason one into a belief; to reason one out of his plan.
11) v. t. - To overcome or conquer by adducing reasons; -- with down; as, to reason down a passion.
12) v. t. - To find by logical processes; to explain or justify by reason or argument; -- usually with out; as, to reason out the causes of the librations of the moon.