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pioneer

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noun [countable] American English pronunciation: pioneer /ˌpaɪəˈnɪr/ 
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singularpioneer
pluralpioneers

Related dictionary definitions

  1. 2
    one of the first people to do something important that is later continued and developed by other people
    pioneer of:

    the pioneers of early color photography

    pioneer in:

    The firm has been a pioneer in the pharmaceutical field since 1953.

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