Western Hemisphere

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

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.

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Origin of Western Hemisphere

First recorded in 1640–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for Western Hemisphere

western hemisphere

noun (often capitals)

that half of the globe containing the Americas, lying to the west of the Greenwich or another meridian
the lands contained in this, esp the Americas
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for Western Hemisphere

Western Hemisphere
[ wĕstərn ]

The half of the Earth that includes North America, Central America, and South America, as divided roughly by the 0° and 180° meridians. See more at prime meridian.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.