Anomaly-a strange, unrecognizable shape in a photograph.

Apparition-a supernatural appearance of a person or thing, another name for ghost

Ball Lightning-a rare form of lightning, consisting of a bright, luminous ball that moves rapidly along objects or floats in the air.

Banshee-(in Irish folklore) a spirit in the form of a wailing woman who appears to or is heard by members of a family as a sign that one of them is about to die.

Demon-an evil spirit believed by many to be a fallen angel who is now in the service of Satan.

Demonologist-one who studies demonology

Demonology-the study of demons or of beliefs about demons.

Doppleganger-a ghostly double or counterpart of a living person.

Ectoplasm-an immaterial or ethereal substance, especially the transparent corporeal presence of a spirit or ghost.

Electromagnetic Field-a field or area that conducts electric and magnetic energy. Many investigators feel that ghosts and spirits give off this type of energy

Electronic Voice Phenomenon(EVP)-the sounds of spiritual voices that are heard through audio equipment. Most of the time, these sounds can not be heard at the time of the recording with the human here.

Elemental- an angry or malicious spirit, also referred to as "earth spirits"

EMF Detector-an electromagnetic field meter which measures the amount of electricity in an area.

Exorcism-expulsion of ghosts, spirits, demons or other entities believed to be disturbing or possessing a human being usually against their free will.

Exorcist-a religious "holy man" who conducts an exorcism.

Ghost-is the energy, soul or personality of a person who has died and has somehow gotten stuck between this plane of existence and the next.

Ghost Hunting-is a general phrase used by some paranormal enthusiasts to describe the process of investigating ghosts and alleged haunting's. Most paranormal groups do not like this term, and like t  o be called paranormal investigating.

Haunting-repeated manifestation of strange and unexplained sensory events such as smells, sounds, tactile sensations, and hallucinations, said to be caused by ghosts or spirits attached to the location.

Infrared Thermometer with probe-a hand held device which measures ambient air temperature. Sudden extreme drops in temperature sometimes means the presence of a spirit.

Instrumental TransCommunication(ITC)-process used to communicate with the dead using an electronic  device or other electronic sensory system such as a television. 

Medium-a person thought to have the power to communicate with the spirits of the dead.

Orb-a small circular type of light that some people feel is the simplest form of a ghost.

Ouija Board-a device that is used to communicate with the dead.

Poltergeist-a German word meaning "Noisy Ghost", is a spirit or ghost that manifests itself by moving and influencing inanimate objects.

Paranormal-meaning beyond the normal.

Residual Haunting-a residual haunting or "Place Memory" is a kind of recording of a past event on an environment, such as a house, building or a battlefield. These recordings play back, over and over in a kind of loop - always the same, like a film or video.  They are not ghosts capable of interacting with the living.

Séance- a sitting organized for the purpose of communicating with the dead or to witness paranormal manifestations through the services of a medium.

Sensitive-a person who is able to use senses beyond the normal five of sight, smell, taste, hear, and touch.

Spirit-a person who has passed on, but has actually gone through The Light and into the Afterlife.

Spirit Photography-photos alleged to reveal ghosts, spirits, or spirits of the dead.

Supernatural-events that take place beyond, or in violation of, the laws of nature.

Thermal Imager-a visual device that show temperature fluctuations through various colors.

Vortex-a vortex is a white funnel like anomalies sometimes captured on film. Also considered an area of concentrated energy that can act as a portal for spirits traveling between the spirit world and this world

Definitions
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Below is a list of definitions thatare used in the field of paranormal investigation.