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From The Collaborative International Dictionary of English v.0.48:
Reason \Rea"son\ (r[=e]"z'n), v. i. [imp. & p. p. Reasoned (r[=e]"z'nd); p. pr. & vb. n. Reasoning.] [Cf. F. raisonner. See Reason, n.] 1. 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. [1913 Webster] 2. 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. [1913 Webster] Stand still, that I may reason with you, before the Lord, of all the righteous acts of the Lord. --1 Sam. xii. 7. [1913 Webster] 3. To converse; to compare opinions. --Shak. [1913 Webster]