aux·il·ia·ry

[awg-zil-yuh-ree, -zil-uh-] adjective, noun, plural aux·il·ia·ries.
adjective
1.
additional; supplementary; reserve: an auxiliary police force.
2.
used as a substitute or reserve in case of need: The hospital has an auxiliary power system in case of a blackout.
3.
(of a boat) having an engine that can be used to supplement the sails: an auxiliary yawl.
4.
giving support; serving as an aid; helpful: The mind and emotions are auxiliary to each other. Passion is auxiliary to art.
noun
5.
a person or thing that gives aid of any kind; helper.
6.
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.
8.
auxiliaries, foreign troops in the service of a nation at war.
9.
Navy. a naval vessel designed for other than combat purposes, as a tug, supply ship, or transport.
10.
Nautical. a sailing vessel carrying an auxiliary propulsion engine or engines.
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Origin:
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.
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World English Dictionary
auxiliary (ɔːɡˈzɪljərɪ, -ˈzɪlə-) [Click for IPA pronunciation guide]
 
adj
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]

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Etymonline
Word Origin & History

auxiliary
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)
adj.

  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
When auxiliary batteries were exhausted, the plant was without power to
  continue cooling reactor cores and spent fuel pools.
So auxiliary factories were called into production: home knitters.
This week British forces agreed to hand over control to a force of
  “auxiliary police” of dubious loyalty.
For major equipment, you may want to purchase auxiliary generators.
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