[an-suh-ler-ee or, esp. British, an-sil-uh-ree]
subordinate; subsidiary.
auxiliary; assisting.
noun, plural ancillaries.
something that serves in an ancillary capacity: Slides, records, and other ancillaries can be used with the basic textbook.

1660–70; < Latin ancill(a) (see ancilla) + -ary; compare Latin ancillāris having the status of a female slave, with -āris -ar1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ancillary (ænˈsɪlərɪ)
1.  subsidiary
2.  auxiliary; supplementary: ancillary services
n , -laries
3.  a subsidiary or auxiliary thing or person: the company has an ancillary abroad
[C17: from Latin ancillāris concerning maidservants, from ancilla, diminutive of ancūla female servant]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1660s, "subservient, subordinate," from L. ancillaris "relating to maidservants," dim. of ancilla "handmaid," fem. dim. of anculus "servant," lit. "he who bustles about," from root of ambi- "about" + PIE *kwol-o-, from base *kwel- "move round, turn about, be much about" (see cycle).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The boric acid has another ancillary function.
Bookstores have called this their fastest growing ancillary market.
That was an ancillary point: Winning again was all that mattered.
Close down unproductive centers, institutes, and other ancillary enterprises.
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