Definitions of relative:

• noun:   an animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus)
• noun:   a person related by blood or marriage

  Example: "Police are searching for relatives of the deceased"

• adjective:   not absolute or complete

  Example: "A relative stranger"

• adjective:   properly related in size or degree or other measurable characteristics; usually followed by `to'

  Example: "Earnings relative to production"