WordReference Random House Unabridged Dictionary of American English © 2020
ISP, 
  • ComputingInternet service provider.

  • ISP, 
  • ComputingInternet Service Provider: a company that offers access to the Internet and to e-mail, usually for a monthly fee.

  • Collins Concise English Dictionary © HarperCollins Publishers::
    ISP abbreviation for
    1. internet service provider, a business providing its customers with connection to the internet and other related services
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