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reason
cause
motive
explanation
Il doit y avoir une bonne raison à tout ce bazar.
There must be a good reason for all this mess.
being right
rightness
correctness
Tu as raison, on devrait annuler la réunion.
You're right, we should cancel the meeting.
the faculty of reason
ability to think logically
sanity (in expressions like 'perdre la raison')
Après l'accident, il a un peu perdu la raison pendant un moment.
After the accident, he lost his sanity for a while.
Notes
GENERAL INFO
Raison (feminine noun) primarily means "reason" or "cause." It can also refer to "right" (as in being correct) or "sense/sanity."
USAGE
It's often used in fixed expressions: "avoir raison" (to be right), "donner raison à quelqu'un" (to agree with someone). "La raison pour laquelle..." means "the reason why...". "Pour quelle raison?" means "For what reason?".
TRAPS
Do not use "être raison" for "to be right"; always use "avoir raison." It's also not used for logical reasoning in the sense of "a reason to believe something" as directly as in English.