Etymology
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Big Brother (n.)

"ubiquitous and repressive but apparently benevolent authority" first recorded 1949, from George Orwell's novel "Nineteen Eighty-Four." The phrase big brother for "older brother" is attested by 1833.

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Definitions of Big Brother
1
big brother (n.)
an older brother;
2
Big Brother (n.)
a totalitarian leader and invader of privacy;
From wordnet.princeton.edu