1. an elder brother.
2. ( sometimes caps. ) a man who individually or as a member of an organized group undertakes to sponsor or assist a boy in need of help or guidance.
3. ( usually caps. ) the head of a totalitarian regime that keeps its citizens under close surveillance.
4. ( usually caps. ) the aggregate of officials and policy makers of a powerful and pervasive state.
5. CB Radio Slang. a police officer or police car.
[ 1860-65; 1949 for defs. 3 and 4, the epithet of a dictator in G. Orwell's novel 1984 ]