UFO and UAP Glossary
UFO and UAP discussions use a mix of military language, astronomy terms, witness labels, case names, and alien lore. This glossary explains the words readers are most likely to see across AlienINT.
Some terms come from science. Some come from government reporting. Others come from witness accounts, books, movies, and decades of UFO culture.
Use this page as a quick reference when a case file, article, interview, or disclosure story uses a term that needs a little context.
Core UFO and UAP Terms
UFO
UFO means unidentified flying object. It is the older and more familiar term for something seen in the sky that has not been identified at the time of the report.
UAP
UAP usually means unidentified anomalous phenomenon. Government offices and military discussions often prefer UAP because it can include objects, lights, sensor tracks, or events that do not fit neatly into the phrase “flying object.”
Flying Saucer
A flying saucer is a disc-shaped craft or object. The phrase became popular after early modern UFO reports in the 1940s and remains one of the classic images of UFO culture.
Orb
An orb is a round light or spherical object reported in the sky. Orb reports can range from distant lights to close, structured objects depending on the witness account.
Anomaly
An anomaly is something that does not match what observers expected to see. In UFO cases, the word can refer to a strange light, unusual movement, odd sensor data, or an event that does not have an immediate explanation.
Close Encounter Terms
Close Encounter
A close encounter is a UFO or UAP event reported at close enough range for details to matter. The phrase was popularized by astronomer J. Allen Hynek.
Close Encounter of the First Kind
A CE-1 is a close sighting of a UFO or UAP. The witness sees the object, but there is no reported physical effect or contact.
Close Encounter of the Second Kind
A CE-2 includes a reported physical effect. Examples can include marks on the ground, interference with electronics, heat, burns, vehicle trouble, or unusual effects on animals.
Close Encounter of the Third Kind
A CE-3 involves the reported sighting of beings, occupants, or entities connected to a UFO or UAP event.
Close Encounter of the Fourth Kind
A CE-4 usually refers to an abduction account or a case where a person reports being taken, moved, or directly controlled by non-human beings.
Close Encounter of the Fifth Kind
A CE-5 refers to human-initiated contact. The phrase is often used by groups that attempt to invite contact through meditation, lights, sounds, or group skywatching.
Alien Encounter and Abduction Terms
Abduction
An abduction is an account in which a person reports being taken by non-human beings. These stories often include missing time, medical procedures, telepathy, bright lights, and fragmented memories.
Missing Time
Missing time describes a gap in memory that a witness connects to a strange encounter. It is common in abduction accounts and late-night road sightings.
Experiencer
An experiencer is someone who says they had direct contact with UFOs, UAP, aliens, or other unexplained beings. Many people prefer this word over “abductee” because not every encounter is described as a kidnapping.
Contactee
A contactee is a person who claims direct communication with extraterrestrial or non-human beings. The term became especially popular during the 1950s flying saucer era.
Telepathy
Telepathy means mind-to-mind communication. UFO and abduction accounts often describe messages received without spoken words.
Implant
An implant is a small object that an experiencer believes was placed in the body during an encounter. Implant stories are common in abduction lore.
Hybrid
A hybrid is described as a being with both human and non-human traits. Hybrid accounts appear often in abduction literature and alien breeding program stories.
Major Cases and Places
Roswell
Roswell refers to the 1947 New Mexico crash story that became the most famous UFO case in American culture. It is closely tied to claims about recovered debris, military secrecy, and alien bodies.
Rendlesham Forest Incident
The Rendlesham Forest incident refers to a series of reported lights and close encounters near U.S. military personnel in England in December 1980. It is often called Britain’s Roswell.
Area 51
Area 51 is a classified U.S. Air Force facility in Nevada. It became central to UFO culture through stories about secret aircraft, recovered craft, and Bob Lazar’s claims about S-4.
Skinwalker Ranch
Skinwalker Ranch is a property in Utah associated with UFO sightings, strange creatures, unusual lights, cattle mutilations, and paranormal reports.
Nimitz Tic Tac
The Nimitz Tic Tac case refers to the 2004 U.S. Navy encounter involving pilots, radar operators, and a white object described as moving in unusual ways over the Pacific Ocean.
Government and Disclosure Terms
Disclosure
Disclosure means the release of official information about UFOs, UAP, alien life, recovered craft, or non-human intelligence. The word can refer to documents, hearings, whistleblower claims, or a broader public reveal.
Whistleblower
A whistleblower is someone who claims to reveal hidden information from inside a government, military, intelligence, or private contractor system.
Crash Retrieval
Crash retrieval refers to claims that a government or military recovered wreckage from a non-human craft. The phrase appears often in modern disclosure debates.
Reverse Engineering
Reverse engineering means studying a device or craft to understand how it works and possibly reproduce the technology. In UFO stories, it usually refers to alleged attempts to study recovered craft.
AARO
AARO stands for the All-domain Anomaly Resolution Office. It is the U.S. government office created to review and analyze UAP reports across different domains, including air, sea, space, and other environments.
Project Blue Book
Project Blue Book was the U.S. Air Force program that investigated UFO reports from 1952 to 1969. It remains one of the most important official programs in UFO history.
MUFON
MUFON stands for the Mutual UFO Network. It is a civilian organization that collects and investigates UFO reports from the public.
Science, Space, and Life Beyond Earth
SETI
SETI means Search for Extraterrestrial Intelligence. SETI projects look for signs of intelligent life beyond Earth, often by searching for radio signals, optical signals, or other technosignatures.
Astrobiology
Astrobiology is the study of life in the universe. It looks at how life begins, where it might exist, and what conditions could support it on other worlds.
Exoplanet
An exoplanet is a planet outside our solar system. Exoplanets matter to alien-life research because some may orbit in zones where liquid water could exist.
Technosignature
A technosignature is a possible sign of technology from another civilization. Examples can include unusual radio signals, lasers, atmospheric pollution, or large artificial structures.
Biosignature
A biosignature is a possible sign of life. In astronomy, this can include gases or chemical patterns in a planet’s atmosphere that may point toward biological activity.
Xenobiology
Xenobiology is the imagined or theoretical study of alien life. It is often used when discussing what non-Earth biology might look like.
Interstellar
Interstellar means between stars. Interstellar travel refers to moving from one star system to another.
Craft, Technology, and Movement
Mothership
A mothership is described as a large craft that carries or supports smaller craft. The idea appears often in UFO reports, science fiction, and contact stories.
Anti-Gravity
Anti-gravity is the idea of reducing, canceling, or controlling gravity. It appears in many UFO propulsion theories because witnesses often describe silent hovering or sudden acceleration.
Wormhole
A wormhole is a theoretical shortcut through space-time. UFO writers sometimes use the idea to explain how beings could travel across vast distances.
Dimensional Travel
Dimensional travel refers to movement between dimensions, realities, or planes of existence. It appears in theories that connect UFOs with consciousness, portals, or parallel worlds.
Vortex
A vortex is a spinning or swirling formation. In paranormal and UFO lore, the word is sometimes used for places believed to involve portals, energy effects, or unusual movement.
Photon
A photon is a particle of light. The term appears in discussions of lasers, signals, energy, and advanced communication.
Quantum Mechanics
Quantum mechanics is the branch of physics that studies matter and energy at very small scales. UFO writers sometimes reference it when discussing exotic propulsion or consciousness theories.
Culture, Mythology, and High Strangeness
Men in Black
Men in Black are mysterious figures said to visit UFO witnesses and pressure them into silence. They are part folklore, part conspiracy legend, and part pop-culture icon.
Alien Autopsy
Alien autopsy refers to stories or footage claiming to show the examination of a non-human body. The phrase is most often connected to Roswell mythology.
Ancient Astronauts
Ancient astronaut theory suggests that extraterrestrial visitors influenced early human civilizations, monuments, religions, or myths.
Crop Circle
A crop circle is a pattern flattened into a field. Some are made by people as art or hoaxes, while others became part of UFO and paranormal folklore.
EVP
EVP means Electronic Voice Phenomena. It refers to voices or sounds found on recordings. EVP is more common in ghost research, but it sometimes appears in alien and paranormal crossover stories.
Skywatch
A skywatch is an organized attempt to observe the night sky for UFOs, UAP, meteors, satellites, or unusual lights.
How to Use This Glossary
A glossary tells you how a term is commonly used. It does not have to settle the entire mystery behind the term.
When reading UFO and UAP stories, pay attention to the category. A word like astrobiology belongs to science. A phrase like Men in Black belongs to folklore and witness lore. A term like disclosure belongs to politics, public records, and government pressure.
That mix is part of what makes the subject so strange and interesting.
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