referee

US /ˌref.əˈriː/
UK /ˌref.əˈriː/
"referee" picture
1.

an official who watches a game or match closely to ensure that the rules are adhered to and to arbitrate on matters arising from the play

:
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The referee blew the whistle to signal the end of the game.
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The player argued with the referee over the foul call.
:
umpirejudgearbiterlinesmanofficial
2.

a person to whom a matter is referred for decision or arbitration

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The dispute was sent to an independent referee for resolution.
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He acted as a referee in the negotiation process.
:
arbitratormediatorconciliatoradjudicator
1.

to act as a referee of (a game or match)

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He was asked to referee the final match of the tournament.
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It's a tough game to referee, with so many fast breaks.
:
umpirejudgeofficiatepreside over
:
assistant referee