Ancillary (adjective)

Providing necessary support to the primary activities or operation of an organization, system, or device.

Origin:

Late 16th century: from latin ancilla "maid, handmaiden", from ancilla "young girl, maid servant", diminutive of ancus "old man".

Examples:

1. The company's ancillary businesses helped to diversify its revenue streams.
2. The ancillary equipment was essential for the proper functioning of the machine.
3. The ancillary services provided by the hospital included physical therapy and rehabilitation.
4. The ancillary staff were responsible for administrative tasks such as scheduling and billing.
5. The ancillary products were designed to complement and enhance the main product.