western hemi sphere

Western Hemisphere

noun
1.
the western part of the terrestrial globe, including North and South America, their islands, and the surrounding waters.
2.
that half of the earth traversed in passing westward from the prime meridian to 180° longitude.
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Collins
World English Dictionary
western hemisphere
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
Western Hemisphere   (wěs'tərn)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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