auxiliary (adj.) Look up auxiliary at
"assisting, giving support," hence "subsidiary, additional," c. 1600, from Latin auxiliaris "helpful, aiding," from auxilium "aid, help, support," related to auctus, past participle of augere "to increase," from PIE root *aug- (1) "to increase."
auxiliary (n.) Look up auxiliary at
c. 1600, "foreign troops in service of a nation at war," from auxiliary (adj.). The Latin adjective also was used as a noun in this sense. In grammar, "a verb used in forming phrases with other verbs and indicating mode or tense," 1762, from the adjective in this sense (1670s). Related: Auxiliaries.