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• sphere
  sphere

  noun
• -sphere
  -sphere

  a combining form of sphere (planisphere ); having a special use in the names of the layers of gases and the like surrounding the earth and other celestial bodies (ionosphere ).

sphere

¹ American  

[sfeer] / sfɪər /

noun

spheres plural

1. Geometry.

   1. a solid geometric figure generated by the revolution of a semicircle about its diameter; a round body whose surface is at all points equidistant from the center. Equation: x 2 + y 2 + z 2 = r 2 .

   2. the surface of such a figure; a spherical surface.

2. any rounded body approximately of this form; a globular mass, shell, etc.

3. Astronomy.

   1. a planet or star; heavenly body.

   2. celestial sphere.

   3. any of the transparent, concentric, spherical shells, or layers, in which, according to ancient belief, the planets, stars, and other heavenly bodies were set.

4. the place or environment within which a person or thing exists; a field of activity or operation.

   to be out of one's professional sphere.

   Synonyms:

   domain, realm, compass, province, area, orbit

5. a particular social world, stratum of society, or walk of life.

   His social sphere is small.

   Synonyms:

   rank, class

6. a field of something specified.

   a sphere of knowledge.

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verb (used with object)

sphered, sphering

1. to enclose in or as if in a sphere.

2. to form into a sphere.

3. to place among the heavenly spheres.

-sphere ² American  

1. a combining form of sphere (planisphere ); having a special use in the names of the layers of gases and the like surrounding the earth and other celestial bodies (ionosphere ).

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sphere ¹ British  

/ sfɪə /

noun

1. maths

   1. a three-dimensional closed surface such that every point on the surface is equidistant from a given point, the centre

   2. the solid figure bounded by this surface or the space enclosed by it. Equation: ( x–a )² + ( y–b )² + ( z–c )² = r ², where r is the radius and ( a, b, c ) are the coordinates of the centre; surface area: 4π r ²; volume: 4π r ³/3

2. any object having approximately this shape; globe

3. the night sky considered as a vaulted roof; firmament

4. any heavenly object such as a planet, natural satellite, or star

5. (in the Ptolemaic or Copernican systems of astronomy) one of a series of revolving hollow globes, arranged concentrically, on whose transparent surfaces the sun (or in the Copernican system the earth), the moon, the planets, and fixed stars were thought to be set, revolving around the earth (or in the Copernican system the sun)

6. particular field of activity; environment

   that's out of my sphere

7. a social class or stratum of society

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verb

1. to surround or encircle

2. to place aloft or in the heavens

-sphere ² British  

combining form

1. having the shape or form of a sphere

   bathysphere

2. indicating a spherelike enveloping mass

   atmosphere

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sphere Scientific  

/ sfîr /

1. A three-dimensional geometric surface having all of its points the same distance from a given point.

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Other Word Forms

Derived Forms

• subsphere
  noun
• sphereless
  adjective
• spherelike
  adjective
• unsphering
  adjective
• -spheric
  combining form

Inflected Forms

Nouns

• spheres
  plural

Etymology

Origin of sphere

1250–1300; < Late Latin sphēra, Latin sphaera globe < Greek sphaîra ball; replacing Middle English spere < Old French spere < Late Latin spēra, variant of sphēra

Explanation

Marbles, oranges, bubbles, and beach balls — all of these objects illustrate the shape of a sphere, or globe (unless the beach balls are under-inflated, in which case they’re sort-of a “squished-sphere” shape). Sphere is often used metaphorically to refer to a particular aspect or area of something. For example, unless you’re a trained circus performer, tightrope walking and fire swallowing probably lie outside of your sphere of expertise. Sphere frequently occurs in the phrase “sphere of influence,” which designates the geographical area over which a person, organization, or nation has control. In many households, whoever is in charge of the cooking controls the kitchen; so, the kitchen falls within his or her sphere of influence.

Example Sentences

See Examples For:

sphere spheres sphered sphering

In May 2024, researchers from Project Hephaistos reported seven promising Dyson sphere candidates, all associated with red dwarfs, after examining a catalog of roughly 5 million stars.

From Science Daily ● Jul. 10, 2026

"The Port of Rotterdam is a key player in this sustainable transition but their sphere of influence is limited," says Bettina Kampman, from environmental consultancy CE Delft, which works for governments, companies and NGOs.

From BBC ● Jul. 9, 2026

Much of the concern that has led to curbs on Anthropic merely reflects how slow the political sphere has been to adapt to the rapid advance of artificial intelligence.

From The Wall Street Journal ● Jul. 8, 2026

To Siebel Newsom, the critiques of her work and the federal probe are part of a broader hounding of women who enter the public sphere.

From Los Angeles Times ● Jul. 7, 2026

His hands were constantly in motion, pulling tools from his belt, working controls, tinkering with his beloved Archimedes sphere.

From "The House of Hades" by Rick Riordan

Queensland authorities warned local residents that the spheres could be "potentially hazardous objects"

From BBC ● Jul. 5, 2026

Beijing appears to aim "to offer economic incentives while monitoring North Korea to ensure it does not act against Beijing's interests in the diplomatic and military spheres", Hong said.

From Barron's ● Jun. 9, 2026

Her passion for storytelling extends beyond the spheres of journalism and history.

From Los Angeles Times ● May 26, 2026

Cavendish suspended two lead spheres from a wire and positioned larger masses nearby.

From Science Daily ● May 18, 2026

Billowy lace netting was secured to the brim by two long pins topped with brass spheres.

From "The City Beautiful" by Aden Polydoros

Some of the Parrot’s recitals have other tales sphered within them, so to say—a plan which must be familiar to all readers of the Arabian Nights.

From Flowers from a Persian Garden and Other Papers by Clouston, William Alexander

Last night, sphered in thy shining, A Circe—mystic destinies divining; To-day but as a feather Torn from a seraph's wing in sinful weather, Down-drifting from the portals Of Paradise, unto the land of mortals.

From Song-Surf by Rice, Cale Young

The sphered life of the race is in its subjects.

From Library of the World's Best Literature, Ancient and Modern, Vol. 16 by Various

They would be sphered in joy, until they heard a sniff and saw the other child standing at the open door, resting its flabby cheek on the handle, surveying them with wild eyes.

From The Judge by West, Rebecca

To us remain the rocking of the deep, the storm upon the land, days of duty and nights of watching; but thou art sphered high above all darkness and fear, beyond all sorrow and weariness.

From Our American Holidays: Lincoln's Birthday A Comprehensive View of Lincoln as Given in the Most Noteworthy Essays, Orations and Poems, in Fiction and in Lincoln's Own Writings by Schauffler, Robert Haven

I stick my head into the workshop and say hello to Ben Morling, founder and MD of both branches, who got into the Segway business after some success with a sphering, or zorbing, company.

From The Guardian ● Aug. 31, 2015

Greater than the sphering sea,  For it holds the sea and land; Seed of all ideas to be  Down its current borne like sand.

From An Anthology of Australian Verse by Stevens, Bertram

Related Words

• circle
• field
• realm
• scope