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auxiliary (B2)

adjective

Pronunciation: /ɔːɡˈzɪliəri/

Providing supplementary or additional help and support.

The company has a fleet of auxiliary vehicles for emergencies.
She took an auxiliary nursing course to help out at the local hospital.
These auxiliary services are essential for the smooth running of the organization.

auxiliary to (prepositional phrase): Serving as a secondary or supplementary aid to something else. — "These measures will be auxiliary to the main efforts."
auxiliary verb (collocation): A verb used to support the main verb in a sentence, e.g., 'be', 'have', 'do'. — "The verb 'do' can act as an auxiliary verb in questions and negatives."