In a manner that persuades someone something is true or real; in a believable or compelling way.
From 'convince' (Latin 'convincere,' to overcome or conquer through evidence) plus '-ingly.' The idea evolved from 'conquering' someone's doubt to 'winning their belief.'
The word 'convince' originally meant 'to conquer'—so when you convince someone, you're literally conquering their doubt through the power of your argument.
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