All articles A–Z
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Altai Mountains (Алтайские горы)
Altai Mountains (Алтайские горы): mountain system across Russia, Mongolia, China, and Kazakhstan, north of the Tianshan; source of the Ob and Irtysh, core of the Altai-Sayan Ecoregion, with the Golden Mountains of Altai World Heritage site (1998).
Altai Republic (Республика Алтай)
Altai Republic (Республика Алтай), a Russian federal republic in southern Siberia with capital Gorno-Altaysk; borders Kazakhstan, China, Mongolia; Belukha 4,506 m; Russians 53.7%, Altaians 37.0%, Kazakhs 6.4% (2021 census).
Altaic languages
Altaic languages: proposed family joining Turkic, Mongolic, and Tungusic, sometimes with Koreanic and Japonic (Transeurasian). Named for the Altai Mountains; most linguists now attribute shared traits to contact and borrowing, not common descent.
Altair
Altair, also known as Alpha Aquilae, is the brightest star in the constellation Aquila, one of the three stars of the Summer Triangle, about 16.7 light-years from the Sun.
Altair 8800
The Altair 8800, also known as the MITS Altair, is a microcomputer kit made by MITS of Albuquerque, New Mexico, introduced in 1975 and credited with launching Microsoft.
Altair Industries
Altair Industries is a New York City private equity firm founded in 2025 by David Waxman and Michael Livanos, taking control positions in middle-market aerospace and industrial companies.
Altair Rupes
Altair Rupes is a lobate scarp (rupes) on Mercury, centered at −70.48°, 186.49° with a diameter of 895.58 km. Named for the Mexican research vessel Altair, it was IAU-approved on April 29, 2021, in quadrangle H-15.
Altaisky Biosphere Reserve
Altaisky Biosphere Reserve (Алтайский заповедник), a UNESCO MAB biosphere reserve in the Altai Mountains, Russia; zapovednik founded 1932, biosphere designation 2009; 3,532,234 ha with Lake Teletskoye, snow leopards, and 326 bird species.
Altamira
Altamira names Altamira Esporte Clube, a Brazilian football club founded 22 July 1973 in Altamira, Pará, nicknamed Onça da Transamazônica, and Mexican clubs from Altamira, Tamaulipas, including Estudiantes de Altamira.
Altamira III and IV power station
The Altamira III and IV power station (Central Ciclo Combinado Altamira III y IV) is a combined-cycle natural gas plant in Altamira, Tamaulipas, Mexico, built by Iberdrola.
Altamira LNG Terminal
The Altamira LNG Terminal is a liquefied natural gas import and regasification terminal at the port of Altamira, near Tampico, Mexico, which received Mexico's first LNG cargo in 2006.
Altamira V power station
Altamira V, also known as Iberdrola Energía del Golfo, is a combined-cycle power station in Altamira, Tamaulipas, Mexico, built by Iberdrola in 2006 and sold to Mexico Infrastructure Partners in 2024.
Altamont Corridor Express
The Altamont Corridor Express (ACE), formerly the Altamont Commuter Express, is a commuter rail service connecting Stockton with San Jose over Altamont Pass, running weekdays since 1998.
Altamont Free Concert
Altamont Free Concert: December 6, 1969 free rock festival at Altamont Speedway near Tracy, California, headlined by the Rolling Stones; about 300,000 attended, four died, including Meredith Hunter, stabbed by a Hells Angel. Called "Woodstock West" and filmed in Gimme Shelter.
Altan (band)
Altan: Irish traditional band from County Donegal, formed 1987 by Mairéad Ní Mhaonaigh and Frankie Kennedy; known for Irish-language song and twin fiddling; 14 albums including Donegal (2024).
Altan Khan
Altan Khan (俺答汗) was a 16th-century Mongol ruler of the Tumed who raided Beijing in 1550, accepted the Ming title Prince Shunyi in 1571, and sponsored the Mongols' Buddhist conversion in 1578.
Altan Khan's campaigns against the Ming
Altan Khan's campaigns against the Ming were raids by the Tümed Mongol leader Altan Khan on Ming China from the 1540s to 1570, seeking trade.
Altan Khan's raid on Beijing
Altan Khan's raid on Beijing, the Gengxu Disturbance of 1550, was a Mongol incursion in which Altan Khan looted the Ming capital's suburbs before withdrawing for promised border trade.
Altan Khan's tribute
Altan Khan's tribute, the Longqing Peace Accord (俺答封贡), was the 1571 settlement by which the Ming dynasty invested the Tümed Mongol ruler Altan Khan as Shun-yi-wang in exchange for an annual horse tribute and border markets.
Altan Tobchi
Altan Tobchi (Алтан товч), meaning "Golden Summary," is a 17th-century Mongolian chronicle compiled by Lubsandanzan around 1651, preserving most of the Secret History of the Mongols.
Altar
An altar, also called an altar-table, is a raised structure or table on which sacrifice, offering, or ritual worship is directed to a deity, spanning traditions from ancient Israel to Christianity.
Altar Boy
Altar Boy (2021) is a Canadian coming-of-age drama, Serville Poblete's debut feature, written by and starring Mark Bacolcol as a shy Filipino-Canadian teen; premiered at Whistler 2021, released by Mongrel Media in 2022. Distinct from The Altar Boys (2025), The Dangerous Lives of Altar Boys (2002), and the Altar Boyz musical.
Altar de Sacrificios
Altar de Sacrificios is a Maya archaeological site in Petén, Guatemala, at the confluence of the Pasión and Salinas-Chixoy rivers, occupied from about 900 BC to AD 900.
Altar of Hieron II
Altar of Hieron II (Ara di Ierone II): monumental altar at Syracuse, Sicily, built by Hieron II (275–215 BCE), probably for Zeus Eleutherios; about 198 m long, the largest ancient Greek altar, with 450 oxen sacrificed per Diodorus; demolished by the Spaniards in the 16th century.
Altar of the Virgin Mary (Creglingen)
The Altar of the Virgin Mary (Marienaltar) is a limewood retable by Tilman Riemenschneider in the Herrgottskirche at Creglingen, Germany, carved about 1505 to 1510.
Altar Q
Altar Q is a carved stone altar at the Maya site of Copán, Honduras, dedicated in 776, with portraits of all sixteen rulers of the city's dynasty.
Altaris, LLC
Altaris, LLC, also known as Altaris Capital Partners, is a New York private equity firm founded in 2003 that invests exclusively in healthcare companies, managing roughly $9 to 10 billion.
Altas Partners
Altas Partners is a Toronto-based private equity firm founded in 2012 by Andrew Sheiner and two partners, which makes only one or two buyout investments a year.
Altaussee
Altaussee, Styrian Salzkammergut municipality in Bezirk Liezen on the Altausseer See; salt mining documented from 1147, brine pipeline from 1211, summer resort since Zedlitz's 1847 Seehaus; 92 km², about 1,850 residents.
AltaVista
AltaVista was a web search engine launched by Digital Equipment Corporation in December 1995, the most popular search engine before Google, shut down by Yahoo in 2013.