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auxiliary

Definition of auxiliary

providing supplementary or additional help and support:auxiliary airport staff the ship has an auxiliary power source
(of troops) engaged in the service of a nation at war but not part of the regular army.
(of a sailing vessel) equipped with a supplementary engine:an auxiliary schooner

an auxiliary person or thing:a nursing auxiliary there are two main fuel tanks and two auxiliaries
North American a group of volunteers giving supplementary support to an organization or institution:members of the Volunteer Fire Department’s women’s auxiliary
Grammar an auxiliary verb.
a naval vessel with a supporting role, not armed for combat.

Origin:

late Middle English: from Latin auxiliarius, from auxilium 'help'

There is only one l in auxiliary.

Definition of auxiliary in the US English dictionary

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