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auxiliary

aux·il·ia·ry [ awg zíllyəree, awg zílləree ]


adjective 
Definition:
 
1. giving support: acting to support or supplement a group of people

2. held in reserve: available as backup for a system, process, or piece of equipment

3. secondary: secondary to something larger

4. nautical with motor and sails: describes a boat with an engine to supplement or replace the sails



noun  (plural aux·il·ia·ries)
Definition:
 
1. supporting person or thing: somebody who or something that has a supporting or supplementary role

2. grammar 
Same as  auxiliary verb


3. military member of supporting troops: a member of a separate troop, often from another country, that fights with an army as allies or mercenaries and has its own command structure
the Coast Guard Auxiliary

4. nautical boat with sails and engine: a boat with an engine to supplement or replace the sails

5. navy naval support vessel: a naval vessel such as a tug or transport ship that does not engage in combat

[Early 17th century. < Latin auxiliarius< auxilium "help, assistance"]
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