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Definition of auxiliary : 1. A helper; an assistant; a confederate in some action or enterprise.
2. A quantity introduced for the purpose of simplifying or facilitating some operation, as in equations or trigonometrical formulae.
3. A verb which helps to form the voices, modes, and tenses of other verbs; -- called, also, an auxiliary verb; as, have, be, may, can, do, must, shall, and will, in English; etre and avoir, in French; avere and essere, in Italian; estar and haber, in Spanish.
4. Conferring aid or help; helping; aiding; assisting; subsidiary; as auxiliary troops.
5. Foreign troops in the service of a nation at war; ( rarely in sing.), a member of the allied or subsidiary force.

Synonyms:

subsidiary, supplement, emergency, contributory, adjuvant, adjutant, standby, collateral, coadjutant, coadjutor, reserve, spare, appurtenant, supportive, supplementary, accessary, increase

executor, agency, instrument, go-between, liaison, intermediary, operative, mediator, broker, factor, middleman, vehicle, actor, impresario, ombudsman

dummy, alternate, envoy, spokeswoman, spokesman, representative, assignee, nominee, stand-in, arm, appointee, emissary, surrogate, double, token, ghost, substitute, understudy, backup, delegate, figurehead, mouthpiece

attorney, patsy, abettor, henchman, hireling, aide-de-camp, proxy, junior, benefactor, associate, acolyte, underling, functionary, flunky, ancillary, accessory, chaperone, backer, attendant, accomplice, helpmate, adjunct, agent, helper, servant, employee, aide, laborer, aider, stooge, minion, partner, subordinate, lieutenant, follower, assistant, deputy, menial, second, extra

serving, helpful, supporting, sustaining, cooperating, helping, assisting, aiding

akin, kindred, coincident, pertinent, relevant, affiliated, analogous, correlative, germane, related, consanguine, concomitant, dependent, associated, blood, connected

addendum, fixture, appendix, garnish, secondary, accompaniment, addition, companion, extension, ornament, brother, appurtenance, consort, adornment, appendage, attachment

affixed, besides, additional, supplemental, attached, adorning, adjoining, ornamental, along with, in addition to

chattel, volunteer, helping hand, slave, pawn, peon, worker, subject, serf, vassal, aid, hand, help

Usage examples:

• Her faith in Hannah was becoming fixed, and it needed some expostulations from Mrs Snow to prevent her from letting the supreme power, as to household matters, pass into the hands of her energetic auxiliary. - "Janet's Love and Service", Margaret M Robertson.
• After the four days of fighting were over, Captain McCalla, with the Marblehead, the auxiliary cruiser St. Louis, and the battle- ship Texas, steamed up the bay to the little village of Caimanera, demolished the fort there with a few well- directed shots, and drove the garrison back into the woods. - "Campaigning in Cuba", George Kennan.
• Sending the auxiliary cavalry in the van, he followed with the other squadrons and his mounted bodyguard. - "The Scarlet Banner", Felix Dahn.