of·fi·ci·ate /əˈfɪʃiˌeɪt/ verb of·fi·ci·ates; of·fi·ci·at·ed; of·fi·ci·at·ing
1 formal :
to perform the official duties of a ceremony [no obj
] — usually + at ▪ Our parish priest officiated at our wedding. ▪ The mayor officiated at the opening of the new public library.
] ▪ The bishop officiated the memorial Mass.
2 sports :
to be a referee, umpire, or judge at a game, tournament, etc. [no obj
] — usually + at ▪ She officiated at the tennis match.
] ▪ Two referees officiated the hockey game.