Etymology
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officiant (n.)

"one who conducts a religious service, one who administers a sacrament," 1836, from noun use of Medieval Latin officiantem (nominative officians) "performing religious services," present participle of officiare "to perform religious services," from Latin officium "a service; an official duty; ceremonial observance" (in Medieval Latin, "church service"); see office.

updated on August 25, 2019

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Definitions of officiant from WordNet

officiant (n.)
a clergyman who officiates at a religious ceremony or service;
From wordnet.princeton.edu, not affiliated with etymonline.