- The definition of semper fidelis, the motto of the U.S. Marines, is always faithful.
An example of semper fidelis is a motto meaning "always faithful."
semper fidelis definition by Webster's New World
Origin: Classical Latin ; from Indo-European base an unverified form sem-, one, uniform, same plush an unverified form per from source per
semper fidelis - Cultural Definition
Latin for “always faithful”; the motto of the United States Marine Corps.