a union designated by a labour relations board or similar government agency as the exclusive representative of all employees in a bargaining unit for the purpose of collective bargaining. Page 146

Union recognized by the employers or designated by a government agency to act as the exclusive representative of employees in a bargaining unit.

A union is the exclusive representative of all workers, both union and non-union, in a bargaining unit. An employer may voluntarily recognize a particular union as a bargaining agent for his workers, or the question of representation may be settled by a secret election, conducted by the appropriate labour relations board.