\ ˈthrē-ˈfāz
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Definition of three-phase
: of, relating to, or operating by means of a combination of three circuits energized by alternating electromotive forces that differ in phase by one third of a cycle
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“Three-phase.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/three-phase. Accessed 5 Mar. 2021.
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The first known use of three-phase was in 1892
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