Meaning

verb act in an official capacity in a ceremony or religious ritual, such as a wedding

verb perform duties attached to a particular office or place or function

originBorrowed 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.); to serve (early 13th c., 14th in British sources); to discharge an office (14th c.)”), from Latin officium (“official duty, service”), see -ate (verb-forming suffix). The noun is derived from…

Etymology from Wiktionary, CC BY-SA 3.0