"ancillary function" is a correct and usable phrase in written English.
You can use it when describing a secondary or supporting function or role of something. For example: - "The marketing team also serves an ancillary function in providing feedback and suggestions to the product development team." - "The office manager's ancillary function includes organizing company events and maintaining employee records."
I never quite got Marcie or Franklin, mid-60s additions who seemed to serve an ancillary function.
Another official said that if the U.S. insisted on running Iraq itself while having the U.N. serve only an "ancillary" function, "we are quite prepared to confine ourselves to a humanitarian role and wish you the best of luck".
In "Zac's Haunted House," recognizable characters, so far as they exist at all, serve an ancillary function to patterns and themes; they mostly help to illustrate the claustrophobic logic of the house.
Unlike the mythical municipalities cited in I Love Paris, Chicago, New York, New York, A Foggy Day in London Town, or even Kansas City, where the city itself is either the subject of, or the inspiration for, the song, Winslow, Arizona, serves but an ancillary function in Take It Easy.
These structures may instead have an ancillary function (e.g. enhancing signal efficacy or modifying information content).
The frequency regulation ancillary function of the dual-BESS scheme [3] has been proposed in this paper.
The drive to cut management layers and to farm out ancillary functions further shrank the training grounds.
Beyond that, there were lumber yards, antique stores, limousine companies, hotels, caterers and others performing ancillary functions.
Mr. Hampton was also more aware than most of the items that required electricity to perform ancillary functions, like stoves and furnaces with electronic pilot ignitions, and thermostats with transformers.
But increasingly, some ancillary functions, like power steering or power brake pumps, or air-conditioning, are performed by electric motors, to lower the load on the internal combustion engine and improve gas mileage.
Yahoo! is now thinking of levying fees for new services and ancillary functions.
