semper fi

interjection
sem·​per fi | \ ˌsem-pər-ˈfī How to pronounce semper fi (audio) \

Definition of semper fi

used as a shortened form of the Latin phrase semper fidelis, "always faithful," motto of the U.S. Marine Corps

First Known Use of semper fi

1950, in the meaning defined above

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Last Updated

17 Sep 2019

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The first known use of semper fi was in 1950

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