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Definition sphere
Etymology
From Middle English spere, from Old French sphere, from Late Latin sph?ra, earlier Latin sphaera (“ball, globe, celestial sphere”), from Ancient Greek ?????? (sphaîra, “ball, globe”), of unknown origin. Compare Persian ???? (sepehr, “sky”)
Noun
sphere (plural spheres)
- (mathematics) A regular three-dimensional object in which every cross-section is a circle; the figure described by the revolution of a circle about its diameter [from 14th c.].
- A spherical physical object; a globe or ball. [from 14th c.]
- (astronomy, now rare) The apparent outer limit of space; the edge of the heavens, imagined as a hollow globe within which celestial bodies appear to be embedded. [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.]
- (mythology) An area of activity for a planet; or by extension, an area of influence for a god, hero etc. [from 14th c.]
- (figuratively) The region in which something or someone is active; one's province, domain. [from 17th c.]
- (geometry) The set of all points in three-dimensional Euclidean space (or n-dimensional space, in topology) that are a fixed distance from a fixed point [from 20th c.].
- (logic) The extension of a general conception, or the totality of the individuals or species to which it may be applied.
Verb
sphere (third-person singular simple present spheres, present participle sphering, simple past and past participle sphered)
Results 426 Words with the letters SPHERE
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