[1] : The Collaborative International Dictionary of English v.0.48

officiate \offi"ciate\, 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
see also:
officiated officiating office 

[2] : WordNet (r) 2.0

officiating
     n : the act of umpiring; "the officiating was excellent" syn: umpirage,
          officiation, refereeing
see also:
umpirage officiation refereeing 

Officiating >> O Words
Officiating, definition of term: Officiating
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