semifinal noun2 •A playoff in the round with only four players or teams left, the stage before the final.Roger Federer extended his grasscourt streak to 57 matches with a victory over Marcos Baghdatis and will play Nicolas Kiefer in the semifinals of the Gerry Weber Open in Halle, Germany. — 2008 •A competition that narrows a field of contestants (semifinalists) to a set of finalists, for a subsequent final. formssemifinals
