1. (

• umpire ,
• ump

) an official at a baseball game ;

2. (

• arbiter ,
• arbitrator ,
• umpire ,

) someone chosen to judge and decide a disputed issue; "the critic was considered to be an arbiter of modern literature"; "the arbitrator's authority derived from the consent of the disputants"; "an umpire was appointed to settle the tax case" ;

1. (

• referee ,
• umpire

) be a referee or umpire in a sports competition ;