(Latin: in, into, within, inside, on, toward [il-, ir-, im-], in, into, etc.: involve, incur, invade; also, used intensively, as in the words inflame and inflammable, or without perceptible force.)

(Latin: key; to enclose, to comprise, to involve; to fit together, or to work together; pertaining to the collarbone [so named because of its keylike shape])

(precursor of hypnotism, believed by Mesmer to involve animal magnetism)