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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:

appurtenant, increase, collateral, subsidiary, accessary, contributory, supplementary, secondary, adjuvant, adjunct, coadjutor, standby, emergency, spare, supplement, aide, supplemental, ancillary, reserve, reserve, coadjutant, accessory, adjutant, supportive.

Usage examples: