Auxiliary Definition
 ôg-zĭlyə-rē, -zĭlə-rē 
  auxiliaries
  
    adjective
  
 Giving assistance or support; helping.
 American Heritage 
Giving help or aid; assisting or supporting.
 Webster's New World 
Acting as a subsidiary; supplementary.
 The main library and its auxiliary branches.
 American Heritage 
Acting in a subsidiary, or subordinate, capacity.
 Webster's New World 
Held in or used as a reserve.
 Auxiliary troops; an auxiliary power generator.
 American Heritage 
Synonyms: 
  
    noun
  
 
    auxiliaries
  
An individual or group that assists or functions in a supporting capacity.
 A volunteers' auxiliary at a hospital.
 American Heritage 
An auxiliary person or thing.
 Webster's New World 
A member of a foreign body of troops serving a country in war.
 American Heritage 
Foreign or allied armed forces aiding those of a country at war.
 Webster's New World 
An auxiliary verb.
 American Heritage 
Other Word Forms of Auxiliary
Noun
Singular:
 auxiliaryPlural:
 auxiliariesOrigin of Auxiliary
-  From Latin auxiliārius (“assistant, ally”), equiv. to auxiliāris (“helping, aiding”), from auxilium (“help, aid”), from augēre (“to increase”). From Wiktionary 
-  Middle English from Latin auxiliārius from auxilium help aug- in Indo-European roots From American Heritage Dictionary of the English Language, 5th Edition 
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