- After Life
- A continued life or existence believed to follow death.
- Agent
- A human being, typically a teenage female, who unknowingly directs poltergeist energy.
- Akashic Records
- "Memories" of all experiences since the beginning of time, believed by some mystical doctrines to be stored permanently in a spiritual substance (Akasha).
- Alien Abduction
- Reported experiences of being abducted by alien creatures, often into spacecraft. Abductees often experience lost time and suffer loss of memory. When memories are recovered, often using hypnotic regression, abductees may report that surgical operations were performed on them.
- Aliens
- Creatures not of this world.
- Alpha Rhythm
- Electrical activity in the brain (about 10 cycles per second) associated with a state of mental relaxation.
- Altered State of Consciousness (A.S.C.)
- Any state of consciousness that is different from "normal" states of waking or sleeping.
- Amulet
- An object that has the power to ward off ghosts and evil spirits.
- Angel
- Benevolent spiritual beings who help and watch over people.
- Animal Magnetism
- A term coined by F.A. Mesmer to refer to a putative force or fluid capable of being transmitted from one person to another, producing healing effects.
- Animal Mutilation
- Refers to cases in which animal corpses (often cattle) have been found with bizarre injuries that do not seem to have a normal explanation in terms of illness, accident, or action of predators. Cuts and injuries often appear to have been carried out with surgical precision. Typically, the corpse is drained of blood. Certain body parts may be absent (e.g., genitals).
- Animal Psi
- Paranormal abilities exhibited by animals. Also known as "Anpsi."
- Animism
- Religious practices based on the belief that all living things and natural objects have their individual spiritual essence or soul.
- Announcing Dream
- A dream believed to announce an individual's rebirth. See also Reincarnation.
- Anomalous Experience
- A general term referring to unusual experiences that cannot be explained in terms of current scientific knowledge.
- Anomalous Phenomena
- Natural phenomena that cannot be explained in terms of current scientific knowledge.
- Apparition
- The disembodied soul or spirit that can be seen visually.
- Apport
- When a solid object seemingly appears from out of nowhere, with the help of the spirits in the presence of a medium.
- Artefact
- In parapsychology, false evidence of paranormal phenomena, due to some extraneous normal influence.
- Asport
- When a solid object is teleported to a different location with the help of the spirits in the presence of a medium.
- Astral Body
- The soul of an individual projected outside of their body.
- Astral Projection
- See Out-Of-Body (OBE).
- Astrology
- A theory and practice which attempts to identify the ways in which astronomical events are correlated with events on earth (e.g., with an individual's personality and biography, or with social and political trends).
- Atmospheric Apparition
- Not actually a ghost or spirit, but instead a "visual imprint" of people and events that was left behind in the environment that continues to replay.
- Aura
- A field of energy believed by some to surround living creatures. Invisible to the naked eye, it is a glow surrounding each individual and changes color and form depending on the mental and physical wellbeing of the individual.
- Automatic Writing
- A type of communication with ghosts or spirits where they take control over the writer's hand and write out a message. The alleged writing or speaking in a language that is unknown to the individual speaking or writing it.
- Automatism
- An unconscious or spontaneous muscular movement caused by ghosts or spirits. Automatic Writing is one form of Automatism.