1660s, "organic structure, organization" (a sense now rare or obsolete), from organize + -ism. Sense of "living animal or plant, body exhibiting organic life" is by 1842. Related: Organismic; organismal.
early 15c., organisen, "to construct, establish," from Old French organiser and directly from Medieval Latin organizare, from Latin organum "instrument, organ" (see organ). Meaning "to form into a whole consisting of interdependent parts" is from 1630s. The intransitive sense of "assume an organic structure" is by 1880. Related: Organized; organizing; organizable.
word-forming element making nouns implying a practice, system, doctrine, etc., from French -isme or directly from Latin -isma, -ismus (source also of Italian, Spanish -ismo, Dutch, German -ismus), from Greek -ismos, noun ending signifying the practice or teaching of a thing, from the stem of verbs in -izein, a verb-forming element denoting the doing of the noun or adjective to which it is attached. For distinction of use, see -ity. The related Greek suffix -isma(t)- affects some forms.