Office
Middle English: via Old French from Latin officium ‘performance of a task’ (in medieval Latin also ‘office, divine service’), based on opus ‘work’ + facere ‘do’.
wiktionary
From Middle English office, from Old French office, from Latin officium(“ personal, official, or moral duty; official position; function; ceremony, esp. last rites”), contracted from opificium(“ construction: the act of building or the thing built”), [1] from opifex(“ doer of work, craftsman”) + -ium(“ -y: forming actions”), [2] from op-(“base of opus: work”) + -i-(“connective”) + -fex(“combining form of facere: to do, to make”). [3]
Use in reference to office software is a genericization of various proprietary program suites, such as Microsoft Office.
etymonline
office (n.)
mid-13c., "a post in government or administration, an employment to which certain duties are attached, secular position of authority or responsibility," from Anglo-French and Old French ofice "place or function; divine service" (12c. in Old French) and directly from Latin officium "a service, kindness, favor; an obligatory service, official duty, function, business; ceremonial observance" (in Medieval Latin, "church service").
The Latin word was contracted from opificium, literally "work-doing," from ops (genitive opis) "power, might, abundance, means" (related to opus "work," from PIE root *op- "to work, produce in abundance") + combining form of facere "to make, to do" (from PIE root *dhe- "to set, put").
Of ecclesiastical positions from late 14c. From c. 1300 as "official employment" in general, also "ecclesiastical service or mass; the prescribed order and form of church services." Meaning "building or room for conducting business" is from late 14c. Meaning "a government or civic department" is from mid-15c. From 1727 as "a privy."
Office hours "hours of work in an office" is attested from 1841. Office furniture, the type used or commonly found in offices, is by 1839. The political office-holder is by 1818. Office-party, one held for the members of a staff, is by 1950. Middle English had office of life "state of being alive" (late 14c.), translating Latin vite officio.
