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The Collaborative International Dictionary of English v.0.48 (gcide)

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.
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{Auxiliary scales} (Mus.), the scales of relative or
attendant keys. See under {Attendant}, a.

{Auxiliary verbs} (Gram.). See {Auxiliary}, n., 3.
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Auxiliary \Aux*il"ia*ry\, n.; pl. {Auxiliaries}.
1. A helper; an assistant; a confederate in some action or
enterprise.
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2. (Mil.) pl. Foreign troops in the service of a nation at
war; (rarely in sing.), a member of the allied or
subsidiary force.
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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.
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4. (Math.) A quantity introduced for the purpose of
simplifying or facilitating some operation, as in
equations or trigonometrical formul[ae]. --Math. Dict.
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