Meaning of AUXILIARY in English

noun a helper; an assistant; a confederate in some action or enterprise.

2. auxiliary ·adj conferring aid or help; helping; aiding; assisting; subsidiary; as auxiliary troops.

3. auxiliary ·noun foreign troops in the service of a nation at war; (rarely in ·sg), a member of the allied or subsidiary force.

4. auxiliary (·sg) a quantity introduced for the purpose of simplifying or facilitating some operation, as in equations or trigonometrical formulae.

5. auxiliary (·sg) 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.

Webster English vocab.      Английский словарь Webster.