| 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. |
| Western Hemisphere The half of the earth comprising North America, Central America, and South America. |
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. |