The crossword solution for the term OFFICIAL, INFORMALLY is REF. A referee, or REF, is an official in a variety of sports who is responsible for enforcing the rules and maintaining the order of the game. Referees are typically impartial and are expected to remain neutral throughout the game. They are also responsible for making sure that the players abide by the rules and regulations of the sport. Referees are usually appointed by the governing body of the sport and are required to have a good understanding of the rules and regulations of the sport.