Meridian or a meridian line (from Latin meridies via Old French meridiane, meaning “midday”) may refer to
Science
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Meridian (astronomy), imaginary circle in a plane perpendicular to the planes of the celestial equator and horizon
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Central meridian (astronomy)
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Meridian (geography), a longitude line, i.e. a line of constant longitude, or in other words an imaginary arc on the Earth's surface from the North Pole to the South Pole
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Meridian arc, the distance between two points with the same longitude
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Prime meridian, origin of longitudes
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Principal meridian, arbitrary meridians used as references in land surveying
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Meridian line, used with a gnomon to measure solar elevation and time of year
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Autonomous sensory meridian response, a static-like or tingling sensation on the skin
Places
Cities and towns
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Meridian, California (disambiguation), U.S., multiple California towns named Meridian
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Meridian, Colorado, U.S.
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Meridian Village, Colorado, U.S.
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Meridian, Florida, U.S.
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Meridian, Georgia, U.S.
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Meridian, Idaho, U.S.
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Meridian, Mississippi, U.S.
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Meridian, Nebraska, U.S.
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Meridian, New York, U.S.
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Meridian, Oklahoma (disambiguation), U.S., multiple Oklahoma towns named Meridian
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Meridian, Pennsylvania, U.S.
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Meridian, Seattle, Washington, U.S.
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Meridian, Texas, U.S.
Townships
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Meridian Township, Clinton County, Illinois, U.S.
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Meridian Charter Township, Michigan, U.S.
Buildings
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Meridian (Amtrak station), or Union Station, Meridian, Mississippi, U.S.
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Meridian Mall, Meridian Township, Michigan, U.S.
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Meridian Mall, Dunedin, New Zealand
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Meridian Hall (Washington, D.C.), listed on the National Register of Historic Places in Washington, D.C., U.S.
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Meridian Manor, listed on the National Register of Historic Places in Washington, D.C., U.S.
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Meridian Mansions, listed on the National Register of Historic Places in Washington, D.C., U.S.
Other places
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Lake Meridian, Kent, Washington, U.S.
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Meridian Creek, a stream in Alaska, U.S.
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Meridian Glacier, Graham Land, Antarctica
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Meridian Peak, Eagles Nest Wilderness, near Vail, Colorado, U.S.
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Meridian Plantation, a quail-hunting plantation in Leon County, Florida, U.S., established in 1915
Arts and entertainment
Print
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Meridian (novel), 1976 novel by Alice Walker
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Meridian (comics), 2000–2004 comic book series published by CrossGen
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Meridian ( W.I.T.C.H.), a fictional realm in the Italian comic book series W.I.T.C.H.
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Meridian, a fictional country in the animated web series MechWest
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Meridians: Feminism, Race, Transnationalism (est. 2000), an interdisciplinary peer-reviewed feminist journal
Film and television
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, 1990 horror and romance film directed by Charles Band
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, 1994 episode of the series
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"Meridian" ( Stargate SG-1), 2002 episode of the series
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Meridian (film), 2016 film noir thriller directed by Curtis Clark
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ITV Meridian (formerly Meridian Broadcasting), ITV station for the south and south-east of England
Music
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Meridian Records, record label
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Meridian Dawn, modern death metal band
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Meridian Green, California-based folk musician
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Meridian, 1997 album by Ian Pooley
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Meridian (Miriam Yeung album), 2007 album by Miriam Young
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Meridian (album), 2012 album by Pinegrove
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"Meridian", 2017 song by Odesza from A Moment Apart
Other art
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Meridian (Hepworth), 1960 bronze sculpture by British artist Barbara Hepworth
Business
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Meridian Audio, British manufacturer of audio equipment
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Meridian Credit Union, credit union based in Ontario, Canada
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Meridian Energy, New Zealand electricity generation and electricity retailing company
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Nortel Meridian, popular PBX telephone system
Education
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Meridian High School (disambiguation)
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Meridian Technology Center, Stillwater, Oklahoma, United States
Transportation
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Meridian (train), British Rail Class 222 trains
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Meridian (commuter rail), former commuter rail service in Germany operated by the Bayerische Oberlandbahn
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MS Meridian, cruise ship constructed in 1961
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Meridian (shipwreck), sunken schooner in Lake Michigan
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Piper Meridian, turboprop model of the Piper PA-46 aircraft
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Meridian LRT station, an LRT station on the Punggol LRT line East Loop in Singapore
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Meridian Airways, a defunct Ghanaian airline
Other
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Bill Meridian (fl. 1972–1983), a financial astrologer
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Meridian (Chinese medicine), traditional Chinese medical theory, often employed in acupuncture
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Meridian (horse), American Thoroughbred racehorse, winner of 1911 Kentucky Derby
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Meridian (Nosgoth), the capital of Nosgoth in Blood Omen 2: Legacy of Kain
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Meridian (perimetry, visual field), polar coordinate system for the visual field
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Meridian (satellite), a series of Russian military communications satellites
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Meridian F.C., English non-league football club
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Meridian Hospital, a private hospital in Port Harcourt, Rivers State, Nigeria
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Meridian Lossless Packing, a lossless audio compression technique used in DVD-Audio, HD DVD, and many Blu-ray discs
See also
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Meridian 59, online game
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Meridian Hill Park, a park in Washington D.C., U.S.
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One Meridian Plaza, an office building that burned down in 1991 in Philadelphia, Pennsylvania, U.S.