A solemn promise you make, usually to do something important or to behave a certain way for the rest of your life.
From Old French 'vou' derived from Latin 'votum' meaning a wish, desire, or solemn promise. The meaning has been consistent since ancient Roman times.
Wedding vows use the same word as medieval monks made vows—both represent humanity's ancient need to make promises so serious that they feel almost sacred, like they change who you are!
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