1) to be under the power of a demon.

 In the NT, these are persons, afflicted with especially severe
 diseases, either bodily or mentally, (such as paralysis, blindness,
 deafness, loss of speech, epilepsy, melancholy, insanity, etc.)
 whose bodies in the opinion of the Jews demons had entered, and so
 held possession of them as not only to afflict them with ills, but
 also to dethrone the reason and take its place themselves;
 accordingly the possessed were wont to express the mind and
 consciousness of the demons dwelling in them; and their cure was
 thought to require the expulsion of the demon.