Longman Dictionary of Contemporary English homepage

reason

2 verb
     
reason2
1 [transitive] to form a particular judgment about a situation after carefully considering the facts
reason (that)
They reasoned that other businesses would soon copy the idea.
2 [intransitive] to think and make judgments:
the ability to reason

reason something ↔ out

phrasal verb
to find an explanation or solution to a problem, by thinking of all the possibilities [= work out]

reason with somebody

phrasal verb
to talk to someone in an attempt to persuade them to be more sensible:
I tried to reason with her.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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