Hemisphere

The word hemisphere literally means "half sphere" or "half ball"; when used in the singular form, it refers to one of the halves of a spherical object. It may be used to mean:

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• one-half of the Earth (or other planetary or stellar body; see also New World and Old World)
• Eastern Hemisphere and Western Hemisphere.
• Northern Hemisphere and Southern Hemisphere.
• A land hemisphere and a water hemisphere.
• one-half of any spherical object, divided at a great circle.
• one-half of certain parts of the brain. The cerebrum, the largest part of the brain, is divided into the right and left cerebral hemispheres; the cerebellum, a smaller part of the brain, is likewise divided into right and left cerebellar hemispheres.
• Hemispheres (album), any of four musical albums.
• Hemispheres (magazine), the inflight publication on United Airlines.