#1 reason n. [ground] a rational motive for a belief or action; "the reason that war was declared"; "the grounds for their declaration". wn
#2 reason n. an explanation of the cause of some phenomenon; "the reason a steady state was never reached was that the back pressure built up too slowly". wn
#3 reason v. [reason out, conclude] decide by reasoning; draw or come to a conclusion; "We reasoned that it was cheaper to rent than to buy a house". wn
#4 reason n. [understanding, intellect] the capacity for rational thought or inference or discrimination; "we are told that man is endowed with reason and capable of distinguishing good from evil". wn
#5 reason v. [argue] present reasons and arguments. wn
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