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English definition of “auxiliary verb”

auxiliary verb

noun [C]  /ɔɡˈzɪl·jə·ri ˈvɜrb/ us  
grammar a verb that gives grammatical information that is not given by the main verb of a sentence: "Has" is an auxiliary verb in the sentence "She has finished her book."
(Definition of auxiliary verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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