
1) Ancient Roman government
Found on
https://www.crosswordclues.com/clue/officium

Latin, meaning: duty, service, job.
Found on
http://archives.nd.edu/ooo.htm
[Ancient Rome] Officium (plural officia) is a Latin word with various meanings in Ancient Rome, including `service`, `(sense of) duty`, `courtesy`, `ceremony` and the like. It also translates the Greek kathekon and was used in later Latin to render more modern offices. However, this article is mainly concerned with the meaning of `an office...
Found on
http://en.wikipedia.org/wiki/Officium_(Ancient_Rome)

The staff. Also an office.
Found on
http://www.encyclo.co.uk/visitor-contributions.php

duty, service, job.
Found on
https://www.math.ubc.ca/~cass/frivs/latin/latin-dict-full.html
No exact match found.