Noun

1. continuing in a course of action without regard to discouragement, opposition or previous failure
2. persistent determination to adhere to a plan of direction; insistence
   • 2004: Chris Wallace, Character: Profiles in Presidential Courage

     It had taken nine years from the evening that Truman first showed up with a pie plate at her mother's door, but his dogged perseverance eventually won him the hand of his boyhood Sunday school crush.