Definition of stakeholders

Stakeholders are groups or individuals who can affect or be affected by the achievements of a business.

Example
Typical stakeholders that define most businesses are customers, employees, suppliers, communities, and shareholders or other financiers.  For some purposes, some companies also consider a broader group that includes governments, media, competitors, non-governmental organisations (NGOs) and others.  Business is about managing key stakeholder relationships. [1]

Financial Times definition
Any party that is committed, financially or otherwise, to a company and is therefore affected by its performance. This would normally include shareholders, employees, management, customers and suppliers. Their interests do not always coincide.