# sphere

^{1}sphere

*noun*\ˈsfir\

: a round object

geometry : a three-dimensional shape that looks like a ball

: an area of influence or activity

## Full Definition of *SPHERE*

*a*

*(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 set

*b*

**:**a globe depicting such a sphere;

*broadly*

**:**globe a

*a*

**:**a globular body

**:**ball

*b*

**:**planet, star

*c*

*(1)*

**:**a solid that is bounded by a surface consisting of all points at a given distance from a point constituting its center — see volume table

*(2)*

**:**the bounding surface of a sphere

**:**natural, normal, or proper place;

*especially*

**:**social order or rank <not in the same

*sphere*as his moneyed friends>

*a*

*obsolete*

**:**orbit

*b*

**:**an area or range over or within which someone or something acts, exists, or has influence or significance <the public

*sphere*>

**spher·ic**\ˈsfir-ik, ˈsfer-\

*adjective,*

*archaic*

**sphe·ric·i·ty**\sfir-ˈi-sə-tē\

*noun*

## Examples of *SPHERE*

- All points on a
*sphere*are the same distance from the center. - Women at that time were confined to the domestic
*sphere*. - They recognize that jobs in the
**public sphere**are valuable.

## Origin of *SPHERE*

*spere*globe, celestial sphere, from Anglo-French

*espere,*from Latin

*sphaera,*from Greek

*sphaira,*literally, ball; perhaps akin to Greek

*spairein*to quiver — more at spurn

## Other Astronomy Terms

## Rhymes with *SPHERE*

^{2}sphere

*transitive verb*

**sphered**

**spher·ing**

## Definition of *SPHERE*

**:**to form into a sphere

## First Known Use of *SPHERE*

## sphere

*noun*

*(Concise Encyclopedia)*

In geometry, the set of all points in three-dimensional space lying the same distance (the radius) from a given point (the centre), or the result of rotating a circle about one of its diameters. The components and properties of a sphere are analogous to those of a circle. A diameter is any line segment connecting two points of a sphere and passing through its centre. The circumference is the length of any great circle, the intersection of the sphere with any plane passing through its centre. A meridian is any great circle passing through a point designated a pole. A geodesic, the shortest distance between any two points on a sphere, is an arc of the great circle through the two points. The formula for determining a sphere's surface area is 4*r*^{2}; its volume is determined by ()*r*^{3}. The study of spheres is basic to terrestrial geography and is one of the principal areas of Euclidean geometry and elliptic geometry.

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