- AAF: Army Air Field. Up to 1947 the US Air Force was know as the Army Air Force. It was an arm of the army, like the infantry and the artillery. On 18 September 1947 it became independent arm of the defence establishment and was redesignated as the US Air Force. Each airfield was thereafter referred to as an Air Force Base (AFB).
- Abduction: A CE4 (close encounter of the fourth kind) whereby a person is removed involuntarily to a waiting alien spacecraft or unknown location where he or she is physically, and perhaps mentally, examined and returned to the pick-up point or somewhere nearby. The experience can last for anything between ten minutes and a few hours.
- BUFORA: The British UFO Research Organization.
- CAUS: Citizens Against UFO Secrecy.
- CSETI: The Center for the Study of Extraterrestrial Intelligence.
- CSICOP: The Committee for the Scientific Investigation of Claims of the Paranormal. It describes the growing interest in 'paranormal' phenomena as an 'apocalypse of unreason', heralding the emergence of a new Dark Age.
- CUFOS: The J. Allen Hynek Center for UFO Studies.
- EBE: Extraterrestrial Biological Entity - a term used in some US government documents to refer to captured visitors from another world.
- Zeta Reticuli: A group of stars from which the greys are said to come.
- Greys: The species of beings said to come from a planet in the star cluster known as Zeta Reticuli. They are generally between 3 feet 5 inches and 4 feet tall, and are said to be the extraterrestrial species responsible for human abductions.
- Essassani: A hybrid species - a genetic cross between earth humans and the greys from Zeta Reticuli.
- FOIA: The US Freedom of Information Act of 1974 which enables American citizens to gain access to hitherto secret US government documents.
- IF: Intruders Foundation, founded by Budd Hopkins.
- INFO: International Fortean Organization.
- IUFOMRC: International UFO Museum and Research Center.
- Merkabah: A thought-form vehicle generated by the thought, feelings and energy of individual people. It takes the shape of a star tetrahedron which is made up of two interlocking tetrahedrons. When it spins as a counter-rotating field of energy it can appear as a 'flying saucer' shape.
- MJ-12: A committee of 12 senior US military and scientific people, also known as Majestic-12, which controls the policy and activities of the US government with regard to extraterrestrials and UFOs.
- MUFON: The Mutal UFO Network.
- NICUFO: The National Investigations Committee on UFOs.
- PEER: The Program for Extraordinary Experience Research.
- Pleiadian: Pertraining to a cluster of stars known as the Pleiades.
- Project Blue Book: An investigation into UFO sightings by the US Air Force, said to have been conducted as a public relations exercise to distract attention from a real investigation being conducted by another agency of the US government.
- SSE: The Society for Scientific Exploration.
- Third dimension: The dimension in which earthly life functions, at a vibrational frequency of 7.3 cm per second, approximately 2.87 inches per second.
- UFO: Unidentified Flying Object.
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