the.com/proxy

Something that stands in so the real thing doesn't have to show up.

means A person or thing authorized to act or speak on behalf of someone else.

from From Latin procuratio ('management, care of affairs'), via Old French and squeezed down through Middle English into 'proxy' — the word itself is basically a contraction, the way 'management, care of affairs' got worn smooth in people's mouths over centuries until only the stand-in essence was left.

origin
short for procuracy, the act of managing for another
networking use
middleman server hiding your real IP address
voting use
lets someone else cast your ballot legally
stats use
a measurable stand-in for something unmeasurable, like IQ
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