| 1. | an elder brother. |
| 2. | (sometimes initial capital letters ) 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 initial capital letters) the head of a totalitarian regime that keeps its citizens under close surveillance. |
| 4. | (usually initial capital letters) the aggregate of officials and policy makers of a powerful and pervasive state. |
| 5. | Citizens Band Radio Slang. a police officer or police car. |
| big brother n.
[Sense 3, after Big Brother, a character in the novel 1984 by George Orwell.] big'-broth'er·ly (bĭg'brŭth'ər-lē) adj. & adv. |