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]
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