Auxiliary

a.	1.	Conferring aid or help; helping; aiding; assisting; subsidiary; as auxiliary troops. Auxiliary scales (Mus.) the scales of relative or attendant keys. See under Attendant, a. Auxiliary verbs (Gram.) See Auxiliary, n., 3.
n.	1.	A helper; an assistant; a confederate in some action or enterprise.
	2.	(Mil.) Foreign troops in the service of a nation at war; (rarely in sing.), a member of the allied or subsidiary force.
	3.	(Gram.) 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; être and avoir, in French; avere and essere, in Italian; estar and haber, in Spanish.
	4.	(Math.) A quantity introduced for the purpose of simplifying or facilitating some operation, as in equations or trigonometrical formulæ.

Noun	1.	auxiliary - someone who acts as assistant Synonyms: aide
Adj.	1.	auxiliary - functioning in a subsidiary or supporting capacity; "the main library and its auxiliary branches" Synonyms: supplemental, supplementary, subsidiary
	2.	auxiliary - relating to something that is added but is not essential; "an ancillary pump"; "an adjuvant discipline to forms of mysticism"; "The mind and emotions are auxilliary to each other" Synonyms: accessory, adjunct, adjuvant, ancillary, appurtenant, subsidiary

abetting, accessory, accident, accidental, acolyte, addendum, addition, additional, adjunct, adjutant, adjuvant, adscititious, adventitious, agent, aid, aide, aide-de-camp, aider, aiding, alter ego, ancillary, another, appendage, appurtenance, appurtenant, ascititious, assistance, assistant, attendant, auxiliary verb, backing, best man, casual, circumstantial, coadjutant, coadjutor, coadjutress, coadjutrix, collateral, complementary, contingency, contingent, contributory, copula, defective verb, deponent verb, deputy, executive officer, extra, farther, finite verb, fortuitous, fostering, fresh, further, girl Friday, happenstance, help, helper, helpful, helpmate, helpmeet, impersonal verb, incidental, inessential, infinitive, instrumental, intransitive, intransitive verb, lieutenant, linking verb, man Friday, mere chance, ministerial, ministering, ministrant, modal auxiliary, more, neuter verb, new, nonessential, not-self, nurtural, nutricial, other, paranymph, paraprofessional, peripheral, plus, reserve, second, secondary, servant, serving, sideman, spare, subordinate, subservient, subsidiary, superadded, superaddition, superfluous, supernumerary, supervenient, supplement, supplemental, supplementary, support, supporter, supporting, supporting actor, supporting instrumentalist, supportive, surplus, transitive, tributary, ulterior, unessential, upholding, verb, verb phrase, verbal