officiating

from WordNet (r) 3.0 (2006)

officiating
    n 1: the act of umpiring; "the officiating was excellent" [syn:
         {umpirage}, {officiation}, {officiating}, {refereeing}]

from The Collaborative International Dictionary of English v.0.48

Officiate \Of*fi"ci*ate\, v. i. [imp. & p. p. {Officiated}; p.
   pr. & vb. n. {Officiating}.] [LL. officiare. See {Office}.]
   To act as an officer in performing a duty; to transact the
   business of an office or public trust; to conduct a public
   ceremony or service. --Bp. Stillingfleet.
   [1913 Webster]