hemisphere

noun
hemi·​sphere | \ ˈhe-mə-ˌsfir How to pronounce hemisphere (audio) \

Definition of hemisphere

1a : a half of the celestial sphere as divided into two halves by the horizon (see horizon sense 1b), the celestial equator, or the ecliptic
b : half of a spherical or roughly spherical body (such as a planet) specifically : the northern or southern half of the earth as divided by the equator (see equator sense 2) or the eastern or western half as divided by a meridian (see meridian sense 1a(2)) affected by the weather in the other hemisphere
c : the inhabitants of a hemisphere of the Earth
2 : an area of knowledge or activity : sphere, province a hemisphere of life heretofore unknown to us
3 : one of two half spheres (see sphere entry 1 sense 2a) formed by a plane (see plane entry 1 sense 2a) through the sphere's center : half of a round object
4 : a map or projection of a celestial hemisphere (see hemisphere sense 1a) or a terrestrial hemisphere (see hemisphere sense 1b)
5 : cerebral hemisphere an injury to the left hemisphere

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Other Words from hemisphere

hemispheric \ ˌhe-​mə-​ˈsfir-​ik How to pronounce hemispheric (audio) , -​ˈsfer-​ \ or hemispherical \ ˌhe-​mə-​ˈsfir-​i-​kəl How to pronounce hemispherical (audio) , -​ˈsfer-​ \ adjective

Did You Know?

Hemisphere includes the prefix hemi-, meaning "half". The northern and southern hemispheres are divided by the equator, the circle halfway between Earth's two poles. The eastern and western hemispheres aren't divided so exactly, since there are no poles in the Earth's east-west dimension. Often the dividing line is said to be the "prime meridian"—the imaginary north-south line that runs through Greenwich, England, from which all longitude is calculated (itself being the 0° meridian). But for simplicity's sake, the eastern hemisphere is often said to include all of Europe, Africa, Australia, and Asia, while the western hemisphere contains North and South America and a great deal of ocean.

Examples of hemisphere in a Sentence

a tumor in the right cerebral hemisphere

Recent Examples on the Web

The luminous celestial glow occurs in both hemispheres, due to electrons from the solar wind colliding with Earth's atmosphere, the Geophysical Institute says. Ryan Prior, CNN, "The northern lights will be visible as far south as Wisconsin and Michigan over Labor Day weekend," 29 Aug. 2019 Earth’s axis is tilted with respect to the sun, so during most of the year, one hemisphere is either tilted away from or toward the sun, driving the seasons. Andrew Fazekas, National Geographic, "Equinox supermoon, and more can't-miss sky shows in March," 1 Mar. 2019 This wasn’t difficult to do, and the U.S. reacted with defensive measures, deploying FBI counterspies throughout the hemisphere. Nicholas Reynolds, WSJ, "‘The Tango War’ Review: The Southern Theater," 24 Oct. 2018 Privacy - Terms The Venezuelan exodus is being felt throughout the hemisphere. Jim Wyss, miamiherald, "Almost 1 million people moved from Venezuela to Colombia in just two years, study shows," 13 June 2018 The southern-hemisphere side climbed to 1,805 points in 2008, the all-time record for Test cricket. M.j., The Economist, "The Ashes will feature the weakest pair of cricket teams in decades," 31 July 2019 The overwhelming majority of tourist dollars go directly toward the repression of the Cuban people and to Cuba’s imperialist policies disrupting our hemisphere. WSJ, "Tourism in Cuba Supports a Repressive State," 13 June 2019 This model shows that the right hemisphere processes negative emotions preferentially, whereas positive emotions are dealt with by the left-sided brain. Rafael Euba, Quartzy, "Why striving for happiness makes people miserable," 23 July 2019 Burning questions The data also seem to confirm another Ionian mystery: Bright eruptions dominate on the trailing hemisphere of Io, the back side of the moon in terms of its orbital motion around Jupiter. Robin George Andrews, National Geographic, "This is our best look yet at the solar system's most volcanic object," 18 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'hemisphere.' 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 hemisphere

14th century, in the meaning defined at sense 1a

History and Etymology for hemisphere

Middle English hemispere, from Latin hemisphaerium, from Greek hēmisphairion, from hēmi- + sphairion, diminutive of sphaira sphere

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Statistics for hemisphere

Last Updated

2 Sep 2019

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Time Traveler for hemisphere

The first known use of hemisphere was in the 14th century

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More Definitions for hemisphere

hemisphere

noun

English Language Learners Definition of hemisphere

: a half of the Earth
: half of a sphere : half of a round object
technical : either of the two halves of the brain

hemisphere

noun
hemi·​sphere | \ ˈhe-mə-ˌsfir How to pronounce hemisphere (audio) \

Kids Definition of hemisphere

1 : one of the halves of the earth as divided by the equator or by a meridian
2 : a half of a sphere
3 : either the left or the right half of the cerebrum

Other Words from hemisphere

hemispheric \ ˌhem-​ə-​ˈsfir-​ik , -​ˈsfer-​ \ or hemispherical \ -​ˈsfir-​i-​kəl , -​ˈsfer-​ \ adjective

hemisphere

noun
hemi·​sphere | \ -ˌsfi(ə)r How to pronounce hemisphere (audio) \

Medical Definition of hemisphere

: half of a spherical structure or organ: as
b : either of the two lobes of the cerebellum of which one projects laterally and posteriorly from each side of the vermis

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More from Merriam-Webster on hemisphere

Rhyming Dictionary: Words that rhyme with hemisphere

Spanish Central: Translation of hemisphere

Nglish: Translation of hemisphere for Spanish Speakers

Britannica English: Translation of hemisphere for Arabic Speakers

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