C1noun2K

Sphere

UK /["/sfɪə(r)/"]/US /["/sfɪr/"]/

Definition

a solid figure that is completely round, with every point on its surface at an equal distance from the centre

In simple words: A round 3D shape like a ball.

Examples

  • The Earth is often described as a sphere due to its round shape.
  • In mathematics, a sphere is defined as a three-dimensional object where all points are equidistant from the center.
  • The artist created a stunning sculpture in the shape of a sphere, capturing the light beautifully.
  • The term 'sphere of influence' refers to an area where one entity has power or influence over others.
  • We often think of the universe as a massive sphere filled with galaxies and stars.

Usage notes

Used in both scientific and everyday contexts. Suitable for discussing shapes, planets, or balls. Avoid in very casual or colloquial conversations.

Grammar pattern

standalone noun

Memory hint

Sounds like 'fear'—imagine a ball that you fear rolling away!

Collocations

  • wider
  • separate
  • academic
  • in somebody’s/​the sphere
  • within somebody’s/​the sphere
  • outside somebody’s/​the sphere
  • a sphere of activity
  • a sphere of influence
  • a sphere of life

Synonyms

  • domain

Antonyms

  • cube
  • rectangle
  • square

Common mistakes

  • Confused with 'spear' due to similar pronunciation.
  • Omitting the 's' when plural (spheres).
  • Confusing the shape with 'circle' which is 2D.