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  1. Oxford American Dictionary

    quadrature amplitude modulation

    • IPA[ˈkwädrəCHər ˈampləˌto͞od ˌmäjəˈlāSHən]
    • n.
      a modulation system used in microwave and satellite communication, involving phase and amplitude modulation of a carrier wave.

    • noun: quadrature amplitude modulation