reason
/ˈrē-zᵊn/
noun
a statement offered in explanation or justification
a rational ground or motive
the thing that makes some fact intelligible : cause
gave reasons that were quite satisfactory
a good reason to act soon
verb
to use the faculty of reason so as to arrive at conclusions
to talk with another so as to influence actions or opinions
to take part in conversation, discussion, or argument
phrasal verb
to find an explanation or solution to (something, such as a problem, question, mystery, etc.) by thinking about the possibilities
He reasoned out the problem by himself.