Definition of big brother
1
: an older brother
2
: a man who serves as a companion, father figure, and role model for a boy
3
capitalized both Bs
[Big Brother, personification of the power of the state in 1984 (1949) by George Orwell]
a
: the leader of an authoritarian state or movement
b
: an all-powerful government or organization monitoring and directing people's actions
