A man who becomes sponsor for a child at baptism, and makes himself a surety for its Christian training and instruction.
- A man who sponsors a person at baptism.
- One that has a relationship to another person or to something that is the equivalent of being a baptismal sponsor: the godfather of a new generation of nuclear physicists.
- Slang The leader of an organized crime family.
- To serve as or as if a godfather to.