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hemisphere

noun

hemi·​sphere ˈhe-mə-ˌsfir How to pronounce hemisphere (audio)
plural hemispheres
1
a
: 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

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.

Example Sentences

a tumor in the right cerebral hemisphere
Recent Examples on the Web His government has also shut down hundreds of civil society groups, as well as universities and media organizations, in one of the most intense waves of repression in the hemisphere. Ana Vanessa Herrero, Washington Post, 19 Aug. 2022 The migration that is occurring throughout the hemisphere is reflective of the economic downturn. ABC News, 3 July 2022 But the more intriguing effect could be how the storm lights up the sky, as in northern lights and southern lights, depending on your hemisphere of choice. Eric Mack, Forbes, 16 Aug. 2022 The exposure was similar, but the telescope pointed towards the southern celestial hemisphere, as far as possible from the first spot. Fabio Pacucci, Scientific American, 15 July 2022 Industrial surveys have found over and over that U.S. businesses want to reshore substantial parts of their operations to this hemisphere. Jake Medwell, Fortune, 14 June 2022 Cuba belongs to the hemisphere, like the other countries. Tracy Wilkinsonstaff Writer, Los Angeles Times, 13 June 2022 Given climate change’s role in an alarming increase of global migration, the US should lead by example in pioneering legal protection pathways for those displaced due to climate disasters in our hemisphere. Krish O'mara Vignarajah, CNN, 4 July 2022 But around the turn of the 20th century, as the American footprint in the hemisphere expanded, Americans saw an imperative — and an opportunity. New York Times, 20 May 2022 See More

Word History

Etymology

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

First Known Use

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

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

Phrases Containing hemisphere

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