Webster's English Dictionary

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auxiliary

1. aux.il.ia.ry \o.g-'zil-y*-re-\ aj [L auxiliaris, fr. auxilium help; akin 
   to Gk auxein to increa]se 1a: offering or providing help  1b: functioning 
   in a subsidiary capacity  of a verb  2: accompanying another verb and 
   typically expressing person, number, mood, or tense 3a: SUPPLEMENTARY  3b: 
   RESERVE  4: equipped with sails and a supplementary inboard engine 
2. auxiliary n 1a: an auxiliary person, group, or device; specif : a member 
   of a f oreign force serving a nation at war 1b: a Roman Catholic titular 
   bishop assisting a diocesan bishop and not having the right of succession 
   2: an auxiliary boat or ship  3: an auxiliary verb