(a) [I] use one's power to think, understand, form opinions, etc 思考; 理解; 推理: man's ability to reason 人的思考能力. (b) [Tf no passive 不用於被动语态] conclude or state as a step in this process 推论; 推断: He reasoned that if we started at dawn, we would be there by noon. 他推断, 我们要是黎明出发, 中午就能到. 
(phr v) reason sb into/out of sth persuade sb by argument to do/not to do sth 以理说服某人做[不做]某事: reason sb out of his fears 劝说某人消除恐惧 * She was reasoned into a sensible course of action. 她听人劝而采取了理智的做法. reason sth out find an answer to (a problem, etc) by considering various possible solutions 考虑各种可能性以找出对（问题等）的解决办法: The detective tried to reason out how the thief had escaped. 这个侦探反复琢磨想弄明白那个窃贼是怎样逃跑的. reason with sb argue in order to convince or persuade sb 为说服某人而与之理论: I reasoned with her for hours about the danger, but she would not change her mind. 我跟她争辩了几个小时,想让她认识到危险性, 但她就是不听. * There's no reasoning with that woman, ie She won't listen to arguments. 那个女人简直不可理喻.> reasoned adj [attrib 作定语] (of an argument, etc) presented in a logical way （指论据等）合乎逻辑的: a reasoned approach to the problem 处理该问题的合理的方法 * She put a (well-)reasoned case for increasing the fees. 对於提高费用, 她提出了（非常）充分的理由.
reasoning n [U] act or process of using one's reason1(2); arguments produced when doing this 运用思考﹑ 理解﹑ 推想等能力的做法或过程; 推理: great power/strength of reasoning 极强的推理能力 * Your reasoning on this point is faulty. 你在这一点上的推论是错误的.