three-phase

adjective
\ ˈthrē-ˈfāz \

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

First Known Use of three-phase

1892, in the meaning defined above

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The first known use of three-phase was in 1892

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