Spīr′it-ū-al-ism, n.

n. 1. The state of being spiritual.

2. (Philos.) The doctrine, in opposition to the materialists, that all which exists is spirit or soul—that what is called the external world is either a succession of notions impressed on the mind by the Deity, as maintained by Berkeley, or else the mere educt of the mind itself, as taught by Fichte.
3. A belief in the frequent communication of intelligence from the world of spirits, by means of physical phenomena, commonly manifested through a person of special susceptibility, called a medium; spiritism.