1 longitude | Definition of longitude

longitude

noun
lon·​gi·​tude | \ ˈlĂ€n-jə-ˌtĂŒd How to pronounce longitude (audio) , -ˌtyĂŒd, British also ˈlÀƋ-gə-\

Definition of longitude

1a : angular distance measured on a great circle of reference from the intersection of the adopted zero meridian with this reference circle to the similar intersection of the meridian passing through the object
b : the arc or portion of the earth's equator intersected between the meridian of a given place and the prime meridian and expressed either in degrees or in time
2 archaic : long duration

Illustration of longitude

Illustration of longitude

longitude 1a: hemisphere marked with meridians of longitude

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Did You Know?

The imaginary (but very important) lines of longitude run from the North Pole to the South Pole. Each is identified by the number of degrees it lies east or west of the so-called prime meridian in Greenwich, England (part of London). A circle is divided into 360°; so, for example, the longitude of the Egyptian city of Cairo is about 31°E—that is, about 31° east of London. The "long" sense of the root may be easier to see in some uses of the adjective longitudinal: A longitudinal study is a research study that follows its subjects over many long years, and a longitudinal engine is one that drives a crankshaft that runs lengthwise under a vehicle (as in rear-wheel-drive cars) rather than crosswise.

Examples of longitude in a Sentence

a map of the world showing lines of latitude and longitude calculating the longitudes of different places The regions are on roughly the same longitude.
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Recent Examples on the Web

In the Sunday strip for October 15, 1961, the title panel shows Charlie Brown’s head as a table globe, imprinted with a grid of latitude and longitude. Nicole Rudick, The New Yorker, "How “Peanuts” Created a Space for Thinking," 6 Aug. 2019 The forecast track carries the storm roughly in the direction of Hawaii, but it's expected to dissipate over the weekend before reaching those longitudes. CBS News, "Hurricane Barbara pushing across Pacific as powerful Category 4 storm," 3 July 2019 Some people have commissioned phrases with personal meaning; others have had their spheres etched with family names, house names, latitude and longitude, or distances to significant destinations. Washington Post, "RIGHT AT HOME: Outdoor decor that’s ‘out there’ and edgy," 19 June 2019 Well, all lines of longitude run through the North Pole. Quanta Magazine, "From Einstein’s Theory to Gravity’s Chirp," 18 Feb. 2016 The extra longitude also helped grow rear cabin legroom without compromising trunk space. Dan Neil, WSJ, "Lexus ES 300h: Spend on the Luxury, Save on Gas Money," 24 Jan. 2019 Of the 20 reviewed by the Times, 17 apps shared exact user latitude and longitude signals with about 70 businesses. Sam Blum, Popular Mechanics, "Popular Apps Are Tracking And Selling Your Location Data to an Alarming Degree," 10 Dec. 2018 Lastly you'll be asked more specific questions like time, date, and even the latitude and longitude of the location. Taylor Mead, House Beautiful, "These Star Map Prints Are The Perfect Holiday Gift To Remember A Special Moment," 28 Nov. 2018 The data received are measurements of satellite-receiver-travel time and can be processed to obtain a ground station's exact longitude and latitude. Matt Blitz, Popular Mechanics, "How GPS Changed the Way We Think About Our Planet," 18 Apr. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'longitude.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of longitude

15th century, in the meaning defined at sense 1a

History and Etymology for longitude

Middle English, from Latin longitudin-, longitudo, from longus

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More Definitions for longitude

longitude

noun

English Language Learners Definition of longitude

: distance measured in degrees east or west from an imaginary line (called the prime meridian) that goes from the North Pole to the South Pole and that passes through Greenwich, England
: an imaginary line that circles the Earth at a particular longitude

longitude

noun
lon·​gi·​tude | \ ˈlĂ€n-jə-ˌtĂŒd How to pronounce longitude (audio) , -ˌtyĂŒd\

Kids Definition of longitude

: distance measured in degrees east or west of an imaginary line that runs from the north pole to the south pole and passes through Greenwich, England

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More from Merriam-Webster on longitude

Rhyming Dictionary: Words that rhyme with longitude

Spanish Central: Translation of longitude

Nglish: Translation of longitude for Spanish Speakers

Britannica.com: Encyclopedia article about longitude