libero
 n.— «The International Volleyball Federation (FIVB) has decided to reduce the pressure of balls for the men’s game by a quarter to give defences a better chance. The libero system—where a designated player can be sent in and out of court by coaches for backcourt play—will be tested at the Grand Prix series this year.» —“Volleyball is to bring in softer balls” AFP July 18, 1996. (source: Double-Tongued Dictionary)