Adjudicator (noun)

1. A person who acts as an arbitrator or judge, especially in a dispute or competition.
2. A person who makes an official decision or judgment.

Origin:

Late 16th century: from latin adjudicat- 'judged', from the verb adjudicare, from ad- 'to' + judicare 'judge'.

Examples:

1. The adjudicator was impartial in the dispute.
2. The adjudicator ruled in favor of the plaintiff.
3. The adjudicator listened to both sides of the argument.
4. The adjudicator was chosen for their expertise in the field.
5. The adjudicator's decision was final and could not be appealed.