norm

Definition 1

Informal guideline about what is considered normal (what is correct or incorrect) social behavior in a particular group or social unit. Norms form the basis of collective expectations that members of a community have from each other, and play a key part in social control and social order by exerting a pressure on the individual to conform. In short, "The way we do things around here."

Definition 2

Formal rule or standard laid down by legal, religious, or social authority against which appropriateness (what is right or wrong) of an individual's behavior is judged.