Etymology
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ancillary (adj.)

"subservient, subordinate, serving as an aid," 1660s, from Latin ancillaris "relating to maidservants," from ancilla "handmaid," fem. diminutive of anculus "servant," literally "he who bustles about," from root of ambi- "around" (from PIE root *ambhi- "around") + PIE *kwol-o-, from root *kwel- (1) "revolve, move round."

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Definitions of ancillary

ancillary (adj.)
furnishing added support;
an ancillary pump
Synonyms: accessory / adjunct / adjuvant / appurtenant / auxiliary
From wordnet.princeton.edu