Definition of polyphase in US English:



  • 1Consisting of or occurring in a number of separate stages.

    ‘a polyphase tectonic interpretation’
    • ‘Precambrian metamorphism and migmatization and the wide spectrum of mainly Alpine mica ages provide clear evidence for such a polyphase geological history.’
    • ‘The Arunta Inlier is an extensive east-west-trending, polyphase, high-grade, predominantly Palaeoproterozoic metamorphic complex.’
    • ‘The Moine rocks widely record polyphase deformation and metamorphism up to amphibolite facies.’
    • ‘The polyphase tectonic and sedimentological development of East African continental rift basins is well-illustrated in the Kilombero Rift Valley in Tanzania.’
    • ‘New palaeomagnetic data from Lower Carboniferous granitoids of the orogenic root of the eastern Variscan belt show a polyphase palaeomagnetic record.’
    1. 1.1 (of an electrical device or circuit) designed to supply or use simultaneously several alternating currents of the same voltage and frequency but with different phases.
      ‘a polyphase induction motor’
      • ‘The reduction in the die area dedicated to capacitance opens up the possibility of building more complex RF circuits, such as image-reject mixers and polyphase IF filters.’
      • ‘In contrast to direct current (which was difficult to transmit more than ten miles), polyphase AC systems proved capable of transmitting power hundreds of miles.’
      • ‘The Energy Policy Act of 1992 required minimum efficiency standards for general purpose, polyphase induction motors.’