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1.
A mode of dealing with the spirit world through the agency of an individual set apart as spirit possessed and specially equipped to deal with superhuman forces. The term Shaman is generically applied to healers, exorcists, sorcerers, magicians, etc.
A practitioner of Shamanism is a Shaman. Shamans gain knowledge and the power to heal by entering into the spiritual world or dimension. The shaman may have, or acquire many spirit guides in the spirit world, these often guide and direct the shaman in his/her travels. These spirit guides are always present within the shaman though others only encounter them when the shaman is in a trance. The spirit guide energizes the shaman, enabling him/her to enter the spiritual dimension. The shaman heals within the spiritual dimension by returning 'lost' parts of the human soul from wherever they have gone. The shaman also cleanses excess negative energies which confuse or pollute the soul. Shaman act as "mediators" in their culture. The shaman communicates with the spirits on behalf of the community, including the spirits of the deceased. The shaman communicates with both living and dead to alleviate unrest, unsettled issues, and to deliver gifts to the spirits. Often, unsettled issues can be resolved with money. Paper money can be burnt to transfer its value to the spirits.
by World_Religions August 03, 2010
 
2.
Shamanism combines a range of traditional beliefs and practices focusing on communication with the spirit world, and higher power. A practitioner of shamanism is known as a shaman.

There are many variations of shamanism throughout the world, but several common beliefs are shared by all forms of shamanism. Shamans are intermediaries between the human and spirit worlds. According to believers, they can treat illness and are capable of entering supernatural realms to obtain answers to the problems of their community.
"Shamanism must take a lot of heart, care and dedication."
by chelliem July 13, 2009