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sphere noun

  /sfɪə(ɹ)/ , /sfɪɚ/
  • An object which appears to be bounded by a sphere; a round object, a ball. [from 14th c.]
  • (historical, astronomy, mythology) Any of the concentric hollow transparent globes formerly believed to rotate around the Earth, and which carried the heavenly bodies; there were originally believed to be eight, and later nine and ten; friction between them was thought to cause a harmonious sound (the music of the spheres). [from 14th c.]
  • (figuratively) The region in which something or someone is active; one's province, domain. [from 17th c.]
  • (logic, dated) The domain of reference of a proposition, subject, or predicate, or the totality of the particular subjects to which it applies.
 σφαίρα
celestial sphere
ουράνια σφαίρα
sphere of influence
σφαίρα επιρροής
armillary sphere
σφαιρικός αστρολάβος
public sphere
δημόσια σφαίρα
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