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Definition of sphere. 1a (1) : the apparent surface of the heavens of which half forms the dome of the visible sky (2) : any of the concentric and eccentric revolving spherical transparent shells in which according to ancient astronomy stars, sun, planets, and moon are setb : a globe depicting such a sphere; broadly : globe a.
hemisphere (Noun). Half of the Earth, such as the Northern Hemisphere, Southern Hemisphere, Western Hemisphere or Eastern Hemisphere, Land Hemisphere, Water Hemisphere etc. . hemisphere (Noun). Any half-sphere, formed by a plane intersecting the center of a sphere.iktionary (0.00 / 0 votes) Rate this definition: hemisphere (Noun). , Half of the celestial sphere, as divided by either the ecliptic or the celestial equator.