noun
plural -sons
[count] :a statement or fact that explains why something is the way it is, why someone does, thinks, or says something, or why someone behaves a certain way
[noncount] :a fact, condition, or situation that makes it proper or appropriate to do something, feel something, etc.
[noncount] :the power of the mind to think and understand in a logical way
[noncount] :ideas and opinions that are fair, sensible, and appropriate
rhyme or reason
stand to reason
to be sensible or understandable
within reason
within reasonable or sensible limits
verb
-sons; -soned; -soning
[no obj] :to think in a logical way
[+ obj] :to form (a conclusion or judgment) by thinking logically
reason out
[phrasal verb]
reason (something) out or reason out (something) :to find an explanation or solution to (something, such as a problem, question, mystery, etc.) by thinking about the possibilities
reason with
[phrasal verb]
reason with (someone) :to talk with (someone) in a sensible way in order to try to change that person's thoughts or behavior