The quality of being intelligent and clever, or looking neat and stylish in appearance.
From 'smart' (possibly from Old English 'smeortan,' meaning to sting or burn), which evolved to mean quick and lively. The noun form adds '-ness' (from Old English suffix for state or condition).
The word 'smart' originally meant a sharp pain or sting, then became 'sharp-witted,' then evolved into 'fashionable'—now 'smart devices' (phones, homes, etc.) bring it full circle, suggesting intelligence through technology rather than fashion or wit.
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