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• Western Hemisphere
  Western Hemisphere

  noun

  the western part of the terrestrial globe, roughly extending from the prime meridian west to the antimeridian: sometimes considered synonymous with the New World because the Americas are its primary composition, the Western Hemisphere technically extends into western Eurasia and Africa, easternmost Siberia, and part of Antarctica as well.
• western hemisphere
  western hemisphere

  noun

  that half of the globe containing the Americas, lying to the west of the Greenwich or another meridian

Western Hemisphere

American  

[wes-tern hem-i-sfeer] / ˈwɛs tərn ˈhɛm ɪˌsfɪər /

noun

1. the western part of the terrestrial globe, roughly extending from the prime meridian west to the antimeridian: sometimes considered synonymous with the New World because the Americas are its primary composition, the Western Hemisphere technically extends into western Eurasia and Africa, easternmost Siberia, and part of Antarctica as well.

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western hemisphere British  

noun

1. that half of the globe containing the Americas, lying to the west of the Greenwich or another meridian

2. the lands contained in this, esp the Americas

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Western Hemisphere Scientific  

/ wĕs′tərn /

1. The half of the Earth that includes North America, Central America, and South America, as divided roughly by the 0° and 180° meridians.

2. See more at prime meridian

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Etymology

Origin of Western Hemisphere

First recorded in 1640–50

Example Sentences

See Examples For:

Western Hemisphere western hemisphere

In the short term, it will probably drive some countries back to burning coal and accelerate oil drilling in the Western Hemisphere.

From Salon ● Jun. 21, 2026

Western Hemisphere hantavirus strains are so deadly because they can attack the lungs and make them leak.

From Los Angeles Times ● May 14, 2026

His focus has been on the ongoing war with Iran, military operations in the Western Hemisphere and domestic concerns.

From BBC ● May 11, 2026

MP is the largest miner of rare-earth materials in the Western Hemisphere and is involved in the entire chain, including the making of rare-earth magnets.

From Barron's ● May 7, 2026

One way to sum up the new scholarship is to say that it has begun, at last, to fill in one of the biggest blanks in history: the Western Hemisphere before 1492.

From "1491" by Charles C. Mann

Kelty is worried that with the onset of the summer planting season in the western hemisphere, the lack of fertilizer could reduce crop yields and lead to higher inflation going forward.

From MarketWatch ● Mar. 19, 2026

He died even after receiving treatment, the first documented such instance in the western hemisphere.

From Salon ● Sep. 22, 2023

The most recent also is the most famous - when an asteroid crashed into what is now Mexico 66 million years ago, setting the western hemisphere on fire and taking out the non-avian dinosaurs.

From BBC ● Dec. 9, 2022

Relations between the U.S. and Mexico were strained by the June summit that was supposed to be about unity among western hemisphere nations.

From Seattle Times ● Jun. 28, 2022

Malcolm was one of the smartest men in the western hemisphere.

From "Confessions of a Murder Suspect" by James Patterson