| 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 |
| 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. |