Meaning of semper fidelis*

sem•per fi•de•lis

Pronunciation: (sem'per fi-dā'lis Eng. sem'p&schwar fi-dā'lis, -dē'-), [key]
— Latin. Latin.
  1. always faithful: motto of the U.S. Marine Corps.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.