semi finalsemi-final [ˈsemi:ˌfaɪnəl, ˈsemaɪ-] [ˈsɛmiˌfaɪnəl, ˈsɛmaɪ-] n. ;; :semi-finals []For them anything less than a semi-final is a catastrophe.the game or set of games before the final game in a competition: France was eliminated in Saturday's semifinal. (Definition of semifinal from