of·fi·ci·ate 
/əˈfɪʃiˌeɪt/ verb
of·fi·ci·ates; of·fi·ci·at·ed; of·fi·ci·at·ing /əˈfɪʃiˌeɪt/ verb 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. [+ obj] ▪ 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. [+ obj] ▪ Two referees officiated the hockey game.
