Definition.com
The Nerd is someone who, before the internet, was getting bullied. After the internet, they became the bullies.
Definition.com
A Nerd is one who finds refuge in personal computers and ranks mathematics above style in the eternal hierarchies.
Definition.com
A Nerd is a poor ungainly misfit, usually a male adolescent, who is scorned and ostracized by his peers for failure to cultivate a sexually knowing persona-until he graduates from engineering school and secures his first job at twice their salary.