officeyoudaoicibaDictYouDict[office 词源字典]
office: [13] Office comes from a Latin source that originally meant ‘do work’. This was officium, a reduced form of an earlier *opificium, which was compounded from opus ‘work’ (source of English opera, operate, etc) and -ficium, a derivative of facere ‘do’ (source of English fact, faction, etc). That original literal sense has now disappeared from English (which got the word via Old French office), but it has left its mark in ‘position, post, job’ and ‘place where work is done’, both of which existed in Latin.

English has a small cluster of derivatives, including officer [14], official [14], officiate [17], and officious [16].
=> fact, factory, fashion, opera, operate[office etymology, office origin, 英语词源]
office (n.)youdaoicibaDictYouDict
mid-13c., "a post, an employment to which certain duties are attached," from Anglo-French and Old French ofice "place or function; divine service" (12c. in Old French) or directly from Latin officium "service, kindness, favor; official duty, function, business; ceremonial observance," (in Church Latin, "church service"), literally "work-doing," from ops (genitive opis) "power, might, abundance, means" (related to opus "work;" see opus) + stem of facere "do, perform" (see factitious). Meaning "place for conducting business" first recorded 1560s. Office hours attested from 1841.