early 15c., organisacioun, "structure of the body or its parts;" mid-15c., "act or process of organizing, the arranging of parts in an organic whole" from Medieval Latin organizationem (nominative organizatio), noun of action from past-participle stem of organizare, from Latin organum "instrument, organ" (see organ).
Sense of "that which is organized" is by 1707; especially "an organized body of persons" (1829). Meaning "system, establishment, constitution" is from 1873. Disparaging organization man, one who conforms his individuality to the organization he serves, is from the title of the 1956 book by American sociologist William H. Whyte (1917-1999). Related: Organizational.