Why is the ninth month called September?
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 Ecclesiastical 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.
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