Webster's Revised Unabridged Dictionary -- Volume AB

Aux·il"iar (?; 106), a. [L. auxiliaris: cf. F. auxiliaire. See Auxiliary.] Auxiliary. [Archaic]

The auxiliar troops and Trojan hosts appear.
Pope.

Aux·il"iar, n. An auxiliary. [Archaic] Milton.

Aux·il"iar·ly, adv. By way of help. Harris.

Aux·il"ia·ry (?; 106), 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.

Aux·il"ia·to·ry (?), a. Auxiliary; helping. [Obs.]

Aux·om"e·ter (?), n. [Gr. ? to increase + -meter.] (Optics) An instrument for measuring the magnifying power of a lens or system of lenses.