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auxiliary

noun [C] (VERB)
 
 
/ɔːɡˈzɪl.i.ər.i/ US  /ɑːɡˈzɪl.i.er-/ (also auxiliary verb)

Definition

a verb that gives grammatical information not given by the main verb of a sentence: In the sentence "she has finished her book", "has" is an auxiliary.Verb forms, tenses and types of verbs
(Definition of auxiliary noun (VERB) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“auxiliary” in other dictionaries

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