Referee - Wikipedia
A referee is an official, in a variety of sports and competition, responsible for enforcing the rules of the sport, including sportsmanship decisions such as ejection.

REFEREE | English meaning - Cambridge Dictionary
A judge is acting as referee in the pay dispute between the trade union and management.

Become a Referee - U.S. Soccer
Learn how to become a soccer referee from the U.S. Soccer referee program.

REFEREE Definition & Meaning | Dictionary.com
REFEREE definition: one to whom something is referred, especially for decision or settlement; arbitrator. See examples of referee used in a sentence.

REFEREE | definition in the Cambridge English Dictionary
A judge is acting as referee in the pay dispute between the labor union and management.

U.S. Soccer Refereeing Program
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referee - Wiktionary, the free dictionary
In sports where the main official is called an umpire, referee can mean an off-field official who is concerned with the administration of the game and the adjudication of disputes about the rules (for example, the tournament referee in tennis or the match referee in cricket).

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Referee (association football) - Wikipedia
In association football, the referee is the person responsible for interpreting and enforcing the Laws of the Game during a match.