respond is on the Academic Word List.

Pronunciation

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Plain form
respond

Third-person singular
responds

Past tense
responded

Past participle
responded

Present participle
responding

  1. (intransitive) If you respond to something or someone, you do something in reaction to it.
    I try to respond to emails as soon as I get them.
    We sent a message to them two weeks ago, but nobody has responded so far.
    The police responded forcefully to the problems.
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Note 1