three phase

three-phase

[three-feyz]
adjective Electricity.
1.
of or pertaining to a circuit, system, or device that is energized by three electromotive forces that differ in phase by one third of a cycle or 120°.
2.
having three phases.

Origin:
1890–95

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Collins
World English Dictionary
three-phase
 
adj
(of an electrical system, circuit, or device) having, generating, or using three alternating voltages of the same frequency, displaced in phase by 120°

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