1 reason /ˈriːzn̩/ noun
plural reasons
1 reason
plural reasons
Learner's definition of REASON
[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

see 1rhyme

stand to reason

: to be sensible or understandable

within reason

: within reasonable or sensible limits
2 reason /ˈriːzn̩/ verb
reasons; reasoned; reasoning
2 reason
reasons; reasoned; reasoning
Learner's definition of REASON
[no object] : to think in a logical way
[+ object] : 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