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officiate (v.)

"to perform the duty of a priest," 1630s, from Medieval Latin officiatus, present participle of officiare "perform religious services," from Latin officium "a service" (in Medieval Latin, "church service"); see office. The earlier verb in English was simply office (mid-15c.). Related: Officiated; officiating.

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Definitions of officiate from WordNet

officiate (v.)
act in an official capacity in a ceremony or religious ritual, such as a wedding;
Who officiated at your wedding?
officiate (v.)
perform duties attached to a particular office or place or function;
His wife officiated as his private secretary
Synonyms: function
From wordnet.princeton.edu