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Attenuated familial adenomatous polyposis
Attenuated familial adenomatous polyposis (AFAP), attenuated FAP, a milder APC-gene variant of familial adenomatous polyposis with fewer than 100 colorectal adenomas, later cancer onset around 55 years, 70% lifetime colorectal cancer risk, and MUTYH-associated polyposis as key differential diagnosis.
Attenuated total reflectance spectroscopy
Attenuated total reflectance (ATR) spectroscopy is an infrared sampling technique that measures a sample's absorption spectrum from a thin surface layer pressed against a crystal.
Attenuated vaccine
Attenuated vaccine (live attenuated vaccine): a vaccine containing a live, laboratory-weakened virus or bacterium, such as MMR, varicella, or oral polio, that replicates to give long-lasting immunity, usually with two doses, but is contraindicated in immunocompromised people.
Attenuation
Attenuation is the gradual loss of a wave's amplitude or intensity as it propagates through a medium or space, affecting radio, light, ultrasound, and seismic waves.
Attenuation coefficient
The attenuation coefficient, also called the linear or narrow beam attenuation coefficient, measures how fast a beam of radiation or sound loses intensity through a medium, following exponential decay.
Attenuation in optical fiber
Attenuation in optical fiber is the loss of optical power per unit length, expressed in dB/km; silica fiber is lowest near 1550 nm at about 0.2 dB/km.
Attenuation phase
Attenuation phase (R-HSA-3371568) is a Reactome human pathway describing shutdown of HSF1 heat shock transcription via Lys80 acetylation, HSP70/HSP40 feedback, HSBP1, and HSP90 binding, conserved in 12 species.
Attenuation tomography
Attenuation tomography is a geophysical imaging method that maps seismic wave attenuation in the Earth's interior, imaging the quality factor Q from recorded amplitudes and spectra of seismic waves.
Attenuator (electronics)
An attenuator in electronics is a passive two-port network that reduces signal power by a specified amount, commonly a fixed resistive pad or a variable, continuously adjustable type.
Atterberg limits
The Atterberg limits are the water contents at which a fine-grained soil passes between liquid, plastic, semisolid, and solid states, comprising the liquid limit, plastic limit, and shrinkage limit.
Attero
Attero is the name of two unrelated companies: Attero B.V., the Dutch market leader in biowaste based in Wilp, and Attero Recycling, an Indian e-waste and battery recycler.
Attest (company)
Attest is a London-based consumer research platform founded in 2015 by Jeremy King, letting brands run no-code surveys against an aggregated panel of over 100 million consumers.
Ättestupa
Ättestupa (ættestup, Ætternisstapi) is the Nordic legend of cliffs from which elderly people jumped or were thrown in pagan antiquity; historians regard it as a myth spread from the 1664 Verelius translation of Gautreks saga, with no written or archaeological evidence.
Atthakatha
Atthakatha (Aṭṭhakathā), meaning "exposition of the sense," is the Theravada commentarial literature on the Pali Tipitaka, largely composed in Sri Lanka in the fifth and sixth centuries CE by Buddhaghosa and other commentators.
Attic
An attic is the space directly below a building's roof and above the main occupied rooms, used for storage, insulation, building services, or, when finished, living space.
Attic calendar
The Attic calendar, also known as the Athenian calendar, was the lunisolar calendar of ancient Athens, used to date civic business, religious festivals, and financial transactions.
Attic Greek
Attic Greek (ἡ Ἀττικὴ διάλεκτος) is the dialect of Attica and Classical Athenian literature, an Ionic-Attic branch dialect marked by ττ spellings and ᾱ. Its Ionicized form became the koine and the basis of Modern Greek.
Attic Nights
Attic Nights (Latin Noctes Atticae) is a learned miscellany in twenty books by the Roman author Aulus Gellius, covering language, literature, history, law, and philosophy.
Attic oratory
Attic oratory is the corpus of speeches composed and delivered at Athens in the fifth and fourth centuries BC, later canonized as models of prose style.
Attic perforation of tympanic membrane
Attic perforation of tympanic membrane (pars flaccida perforation, ICD-11 AB13.1) is a hole in the upper, Shrapnell's membrane segment of the eardrum; an unsafe perforation with elevated risk of cholesteatoma and mastoiditis, usually managed surgically.
Attica
Attica (Ἀττική) is the triangular Greek peninsula of Athens, bounded by Cithaeron and Parnes with apex at Sunium; home of the Laurion silver mines, unified by synoecism, and organized by Cleisthenes into 139 demes, 30 trittyes, and 10 tribes.
Attica (Αττική) (region)
Attica (Αττική) is Greece's most populous administrative region, 3,814,064 residents in 2021, covering the Athens peninsula, Troizinia, Saronic Gulf islands, and Kythera; eight regional units, seat Athens, over 40% of national GDP.
Attica Correctional Facility
Attica Correctional Facility: maximum-security New York State prison in Wyoming County, opened 1931; site of the September 1971 uprising, the deadliest in U.S. prison history, with 43 deaths.
Attica Prison riot
Attica Prison riot: September 9-13, 1971 uprising at Attica Correctional Facility, New York, also called the Attica uprising; about 1,000 inmates seized the prison, took 42 hostages, and 43 people died when Governor Rockefeller ordered the retaking.
Atticus
Atticus (died 425) was bishop of Constantinople from 406 to 425. An Armenian ascetic, he ended the Johannite schism by restoring John Chrysostom's name to the public prayers.
Atticus (philosopher)
Atticus was a second-century Middle Platonist philosopher active in Athens around 178 CE, known for his uncompromising rejection of Aristotle and defense of a literal reading of Plato's Timaeus.
Atticus Cogar
Atticus Cogar, born 1997, is an American deathmatch-style professional wrestler from Ohio, brother of Otis Cogar, former GCW World Champion (November 2025 to August 2026) and winner of the 2025 Career vs Mask match against Fuego Del Sol.
Atticus Finch
Atticus Finch is the fictional Maycomb, Alabama, lawyer and father in Harper Lee's To Kill a Mockingbird (1960), modeled on her father A.C. Lee, later recast as a segregationist in Go Set a Watchman (2015).
Atticus Ross
Atticus Ross (Atticus Matthew Cowper Ross), British composer and producer born in London, Nine Inch Nails member since 2016 and Trent Reznor's scoring partner, with Oscars for The Social Network and Soul and a 2025 BMI Icon honor.
Atticus Shaffer
Atticus Shaffer (born 1998, Santa Clarita, California) is an American actor who played Brick Heck on ABC's The Middle (2009–2018) and voices Ono in The Lion Guard; he has osteogenesis imperfecta type IV.