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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]