Something that serves to illustrate or explain a rule.
Something that serves as a pattern of behaviour to be imitated (a good example) or not to be imitated (a bad example).
Something that is representative of all such things in a group.
A person punished as a warning to others.
A parallel or closely similar case, especially when serving as a precedent or model.
An instance (as a problem to be solved) serving to illustrate the rule or precept or to act as an exercise in the application of the rule.
To be illustrated or exemplified (by).
As an example.