adjective
capable of supplying or intended to supply aid or support
an auxiliary police unit
Synonyms: accessory, adjuvant, ancillary, appurtenant, collateral, contributory, subservient, subsidiary
Related Word: complementary, supplementary; peripheral, secondary, subordinate, tributary; backing, supporting, upholding; aiding, assisting, helping
Contrasted words: chief, leading, main, principal; sole, solitary, unique