Meaning of AUXILIARY in English

AUXILIARY

(sing.) 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's English dictionary.      Английский словарь Webster.