Definitions
1.NounA person who is intellectual but generally introverted."The bullies used to call him a nerd at school."
2.NounOne who has an intense, obsessive interest in something."a computer nerd; a comic-book nerd"
3.NounA member of a subculture revolving around intellectualism, technology, video games, fantasy and science fiction, comic books and assorted media. .mw-parser-output .defdate{font-size:smaller}
4.NounOne who is stupid and socially inept or unattractive; a social outcast.