In a way that is incorrect or based on mistaken ideas; wrongly or inaccurately.
From 'erroneous' (incorrect, from Latin 'erroneus') plus the adverb suffix '-ly'. The root 'errare' means 'to wander' or 'to err'.
When you believe something 'erroneously,' you're wandering away from the truth without knowing it—the word captures the idea that the mistake wasn't intentional!
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