sphere

(sfĭr)

1. Mathematics A three-dimensional surface, all points of which are equidistant from a fixed point.
2. A spherical object or figure.
3. A celestial body, such as a planet or star.
4. The sky, appearing as a hemisphere to an observer: the sphere of the heavens.
5. Any of a series of concentric, transparent, revolving globes that together were once thought to contain the moon, sun, planets, and stars.
6. The extent of a person's knowledge, interests, or social position.
7. An area of power, control, or influence; domain. See Synonyms at field.

1. To form into a sphere.
2. To put in or within a sphere.
3. To surround or encompass.

Related Forms:

• sphe·ricˈi·ty (sfî-rĭsˈĭ-tē) noun