noun
sphere
sfeer
noun
1
A perfectly round, three-dimensional shape, like a ball.
"The planet is roughly a sphere."
"They filled the glass sphere with tiny lights for the display."
2
A particular area of activity, interest, or influence.
"Climate policy falls outside his usual sphere of expertise."
How to Use Sphere
Learner’s notesIn plain EnglishA round, ball-shaped object, or figuratively an area of activity or influence.
Common pairings
sphere of influence
a perfect sphere
private sphere
Word Forms
sphered past tense, spheres plural, spheres singular
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The planet is roughly a _____.
Etymology
From Old French sphere, from Late Latin sphēra, from Ancient Greek σφαῖρα (sphaîra, "ball, globe").