The definition of an exemplar is person or thing that is considered as a pattern to be copied. An example of an exemplar is a person that others try to imitate, such as Michael Jackson. An example of an exemplar is a copy of a manuscript.
A stakeholder in education is anyone who has an interest in the success of a school or school system. They are the parties that are either directly or indirectly affected by the success of an education system.
Quite simply, a stakeholder is a person, or group, who affects or is affected by an organisation or project. So whilst the owners of a business are stakeholders so are its customers, employees, suppliers, neighbours, interest groups, local community etc.