WordNet
n. any imaginary place where spiritual beings (demons or fairies or a\ngels or the like) abide; "science has emptied the spirit world of its former inhabitants"
Wikipedia
In Latter Day Saints theology, the term spirit world refers to the realm where the spirits of the dead await the resurrection. In LDS thought, this spirit world is divided into at least two conditions: paradise and spirit prison:
Paradise includes "the spirits of the just, who had been faithful in the testimony of Jesus while they lived in mortality."
Spirit prison is the condition of the spirits of "the wicked ... the ungodly and the unrepentant who had defiled themselves while in the flesh ... the rebellious who rejected the testimonies and the warnings of the ancient prophets". The latter will continue to receive gospel teaching and be given the opportunity to repent, though their disposition toward repentance will only change as they recognize and accept gospel truths and believe in Jesus Christ.
Spirit world may refer to:
The spirit world, according to Spiritualism, is the world or realm inhabited by spirits. Whereas religion regards an inner life, the spirit world is regarded as an external environment for spirits. Although independent from the natural world, both the spirit world and the natural world are in constant interaction. Through mediumship, these worlds can consciously communicate with each other. The spirit world of Spiritualism can be described by mediums in trance.