Enterprise or Recognized Subdivision
A recognizable subpart within an employer's larger operation that has a permanent status and a continuing function. For example, a large employer's human resources department might have subdivisions for labor relations, pensions and other benefits, equal employment opportunity, and personnel management, each of which has a permanent status and function.
When an enterprise has more than one establishment (or branch), each establishment (branch) may be a recognized subdivision of the enterprise. A recognized department or subdivision does not need to be physically located within the employer's establishment and may move from place to place and/or may consist of employees drawn from other recognized units or from a pool of available employees (e.g., a construction crew which moves from job to job).
Source: U.S. Department of Labor