Webster
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Webster’s Revised Unabridged Dictionary · 1913

Auxiliary

Aux·il′ia·ry, a. [L. auxiliarius, fr. auxilium help, aid, fr. augere to increase.] 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.

Aux·il′ia·ry, n.; pl. Auxiliaries. 1. A helper; an assistant; a confederate in some action or enterprise.

2. (Mil.) pl. 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. Math. Dict.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.