ancillary
adj
2 auxiliary; supplementary
ancillary services
n pl , -laries
3 a subsidiary or auxiliary thing or person
the company has an ancillary abroad
(C17: from Latin ancillaris concerning maidservants, from ancilla, diminutive of ancula female servant)
English Collins Dictionary - English Definition & Thesaurus  

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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"