To perform the functions of some office.
She officiated as registrar at the wedding.
To serve as umpire or referee.
This is the second time he has officiated at a cup-final.
A person appointed to office, an official.
Borrowed from Latin officiātus, perfect participle of Late Latin officior (“to perform a function”) and of Medieval Latin officiō (“to officiate, say mass (9th cent.); to serve a church (13th cent.); ...
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