hemisphere

noun

Etymology: From Latin hemisphaerium, from Ancient Greek ἡμισφαίριον (hēmisphaírion), from ἡμι- (hēmi-, “half”) + σφαῖρα (sphaîra, “sphere”). Equivalent to hemi- + sphere. Displaced native Old English healftrendel (literally “half-sphere”).

1. Half of the celestial sphere, as divided by either the ecliptic or the celestial equator .
2. A realm or domain of activity .

   “Love is the Columbus of our moral world, and opens, at some period or other, a new hemisphere to our view.”

3. Half of the Earth, such as the Northern Hemisphere, Southern Hemisphere, Western Hemisphere or Eastern Hemisphere, Land Hemisphere, Water Hemisphere etc. .

   “Bangkok typically sees temperatures between 73 and 91 degrees Fahrenheit (23 to 33 degrees Celsius) during January, according to the Tourism Authority of Thailand – one reason why it’s a paradise for many tourists looking to escape winter in the northern hemisphere.”

4. Any half-sphere, formed by a plane intersecting the center of a sphere. .
5. A map or projection of a celestial or terrestrial hemisphere .
6. Either of the two halves of the cerebrum. .