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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.
sphere. great circle - Any circle on the surface of a sphere that lies on a plane through its center, or a circle that divides into two equal partsâas the Equator. quadrant - A quarter of a circle or sphere. rhumb line - A line on a sphere that cuts all meridians at the same angle; the path taken by a ship or plane that maintains a constant compass direction. diameter - From Greek, meaning measure through (a circle or sphere, etc.). Sphere the persons with whom one is normally in contact, 1839; a group of persons of a certain rank, standing, or interest, 1601.