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auxiliary
From The Collaborative International Dictionary of English v.0.48:
Auxiliary \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. [1913 Webster] Auxiliary scales (Mus.), the scales of relative or attendant keys. See under Attendant, a. Auxiliary verbs (Gram.). See Auxiliary, n., 3. [1913 Webster] .
From The Collaborative International Dictionary of English v.0.48:
Auxiliary \Aux*il"ia*ry\, n.; pl. Auxiliaries. 1. A helper; an assistant; a confederate in some action or enterprise. [1913 Webster] 2. (Mil.) pl. Foreign troops in the service of a nation at war; (rarely in sing.), a member of the allied or subsidiary force. [1913 Webster] 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; [^e]tre and avoir, in French; avere and essere, in Italian; estar and haber, in Spanish. [1913 Webster] 4. (Math.) A quantity introduced for the purpose of simplifying or facilitating some operation, as in equations or trigonometrical formul[ae]. --Math. Dict. [1913 Webster]

