Auxiliary services usually refer to additional services that support the main function or purpose of something. These services provide assistance or extra help to make things run smoothly or fulfill specific needs. Full definition
Service providers: Individuals and companies that bring auxiliary services in a real estate transaction. (realtormag.realtor.org)
As a state - of - the - art veterinary hospital, we also offer auxiliary services such as house call services. (holisticveterinaryhealing.com)
For a revenue ticket, fifth freedom flights are often cheaper than buying tickets for a regular route because airlines often treat them as auxiliary service on the way to their main destination. (rewardexpert.com)