semper fidelis

The definition of semper fidelis, the motto of the U.S. Marines, is always faithful.

(adjective)

An example of semper fidelis is a motto meaning "always faithful."

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See semper fidelis in Webster's New World College Dictionary

always faithful: motto of the U.S. Marine Corps

Origin: L < IE base *sem-, one, uniform, same + *per > per

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