auxiliary verb

The definition of an auxiliary verb is used to change the tense or voice of other verbs.

(noun)

An example of an auxiliary verb is "be", "do" or "have."

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See auxiliary verb in Webster's New World College Dictionary

Gram. a verb used to help form the tenses, aspects, voices, or moods of other verbs, as will, have, do, be, should, must

See auxiliary verb in American Heritage Dictionary 4

noun Abbr. aux. or aux. v.
A verb, such as have, can, or will, that accompanies the main verb in a clause and helps to make distinctions in mood, voice, aspect, and tense.

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