Definition of reason (Entry 1 of 2)
1a : a statement offered in explanation or justification
gave reasons that were quite satisfactory
b : a rational ground or motive
a good reason to act soon
c : a sufficient ground of explanation or of logical defense
especially : something (such as a principle or law) that supports a conclusion or explains a fact
the reasons behind her client's action
d : the thing that makes some fact intelligible : CAUSE
the reason for earthquakes
the real reason why he wanted me to stay
— Graham Greene
2a(1) : the power of comprehending, inferring, or thinking especially in orderly rational ways : INTELLIGENCE
(2) : proper exercise of the mind
(3) : SANITY
b : the sum of the intellectual powers
3 archaic : treatment that affords satisfaction
in reason
: RIGHTLY, JUSTIFIABLY
within reason
: within reasonable limits
with reason
: with good cause
reason verb
Definition of reason (Entry 2 of 2)
intransitive verb
1a obsolete : to take part in conversation, discussion, or argument
b : to talk with another so as to influence actions or opinions
can't reason with them
2 : to use the faculty of reason so as to arrive at conclusions
transitive verb
1 archaic : to justify or support with reasons
2 : to persuade or influence by the use of reason
3 : to discover, formulate, or conclude by the use of reason
a carefully reasoned analysis
GOP Senator: AOC and “Squad” are “The Reason There Are Directions on Shampoo Bottles”