Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: auxiliaris, from auxilium 'help'

auxiliary

1 adjective
     
aux‧il‧ia‧ry1
1 auxiliary workers provide additional help for another group of workers:
an auxiliary nurse
auxiliary staff
2T an auxiliary motor, piece of equipment etc is kept ready to be used if the main one stops working properly:
an auxiliary power supply
auxiliary equipment

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