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subordinate; subsidiary.
auxiliary; assisting.
something that serves in an ancillary capacity:
Slides, records, and other ancillaries can be used with the basic textbook.
Contemporary Examples

The most sustainable impact—assuming there are no hitches legally—will be ancillary things like that.
Ganjapreneurs Flock to Colorado Following Marijuana Legalization Abby Haglage, Caitlin Dickson January 28, 2014

But even as the music market goes global, the ancillary cost is a troubling conglomeratization of thought, style, and taste.
Van Dyke Parks on How Songwriters Are Getting Screwed in the Digital Age Van Dyke Parks June 3, 2014

The first round failed to achieve any progress even on ancillary issues, such as humanitarian access to the besieged city of Homs.
Russian Foreign Minister: We Can’t Get Assad to Do Anything Josh Rogin January 31, 2014

There are ancillary benefits to donating extra campaign cash, too, Miniutti said.
Ex-Politicians Keeping $100 Million in Private Slush Funds Dave Levinthal, Center for Public Integrity May 21, 2014

The column also referenced a recent IdeaWorksCompany study that said airlines made $22.6 billion in ancillary revenues last year.
Those Awful Airline Fees From United, American, Delta, and the Rest Add Up William J. McGee August 12, 2012

Historical Examples

This is the case among the leisure class and among certain portions of the population which are ancillary to that class.
The Theory of the Leisure Class Thorstein Veblen

But Madame Montessori’s relation to the feminist movement is, after all, ancillary.
Women as World Builders Floyd Dell

The negative (they think) can only be tolerated in small doses, and even then merely as ancillary to the affirmative.
Plato and the Other Companions of Sokrates, 3rd ed. Volume I (of 4) George Grote

The functions of the archdeacon are in the present day ancillary in a general way to those of the bishop of the diocese.
Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 4 Various

The evidence for the ancillary dmons and gods he finds in the familiar places.
The Conflict of Religions in the Early Roman Empire T. R. Glover

adjective
subsidiary
auxiliary; supplementary: ancillary services
noun (pl) -laries
a subsidiary or auxiliary thing or person: the company has an ancillary abroad
adj.

1660s, “subservient, subordinate,” from Latin ancillaris “relating to maidservants,” diminutive of ancilla “handmaid,” fem. diminutive of anculus “servant,” literally “he who bustles about,” from root of ambi- “about” (see ambi-) + PIE *kwol-o-, from root *kwel- “move round, turn about, be much about” (see cycle (n.)).

ancillary an·cil·lar·y (ān’sə-lěr’ē)
adj.
Relating to or being auxiliary or secondary.