Early 16th century. From post-classical Latin officiarius mid 19th century; earliest use found in The Ladies' Repository. Apparently from officiary or its etymon post-classical Latin officiarius; compare -y.
Definition of officiary in US English:
officiary
noun
rare
An officer or official.
noun
US
A body of officers; an official body.
Origin
Early 16th century. From post-classical Latin officiarius<br>mid 19th century; earliest use found in The Ladies' Repository. Apparently from officiary or its etymon post-classical Latin officiarius; compare -y.