- The belief that the dead communicate with the living, as through a medium. (noun)
- The practices or doctrines of those holding such a belief. (noun)
- A philosophy, doctrine, or religion emphasizing the spiritual aspect of being. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.