[awg-zil-yuh-ree, -zil-uh-]
additional; supplementary; reserve: an auxiliary police force.
used as a substitute or reserve in case of need: The hospital has an auxiliary power system in case of a blackout.
(of a boat) having an engine that can be used to supplement the sails: an auxiliary yawl.
giving support; serving as an aid; helpful: The mind and emotions are auxiliary to each other. Passion is auxiliary to art.
noun, plural auxiliaries.
a person or thing that gives aid of any kind; helper.
an organization allied with, but subsidiary to, a main body of restricted membership, especially one composed of members' relatives: The men's club and the ladies' auxiliary were merged into one organization.
auxiliaries, foreign troops in the service of a nation at war.
Navy. a naval vessel designed for other than combat purposes, as a tug, supply ship, or transport.
Nautical. a sailing vessel carrying an auxiliary propulsion engine or engines.

1595–1605; < Latin auxiliārius assisting, aiding, helping, equivalent to auxili(um) aid, help (aux(us) increased, augmented (past participle of augēre: aug- increase + -sus, variant of -tus past participle suffix) + -ilium noun suffix) + -ārius -ary

2. backup, ancillary, secondary. 5. aide, ally, assistant; help. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
auxiliaries (ɔːɡˈzɪljərɪz, -ˈzɪlə-)
pl n
foreign or allied troops serving another nation; mercenaries

auxiliary (ɔːɡˈzɪljərɪ, -ˈzɪlə-)
1.  secondary or supplementary
2.  supporting
3.  nautical (of a sailing vessel) having an engine: an auxiliary sloop
n , -ries
4.  a person or thing that supports or supplements; subordinate or assistant
5.  nautical
 a.  a sailing vessel with an engine
 b.  the engine of such a vessel
6.  navy a vessel such as a tug, hospital ship, etc, not used for combat
[C17: from Latin auxiliārius bringing aid, from auxilium help, from augēre to increase, enlarge, strengthen]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1600, from L. auxiliaris "helpful," from auxilium "aid, help, support," related to auctus, pp. of augere "to increase" (see augment). Military noun meaning "foreign troops in service of a nation at war" is from c.1600.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

auxiliary aux·il·ia·ry (ôg-zĭl'yə-rē, -zĭl'ə-rē)

  1. Functioning in an augmenting capacity; supplementary.

  2. Functioning as a subordinate; secondary.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
My favorite part of speech is the group of little guys known as modal
  auxiliaries or informally, modals.
He should think much harder about whether his plans for civilian auxiliaries
  are wise.
Prisons are being broken open, weapons looted, policemen and police auxiliaries
  are turning gangster.
Literatures lend things of worth to one another, but only as auxiliaries and by
  gradual stages.
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