sphereとは

別の表記

• sphære (古風な用法)
• sphear (古風な用法)

語源

From Middle English spere, from Old French sphere, from Late Latin sphēra, earlier Latin sphaera (“ball, globe, celestial sphere”), from Ancient Greek σφαῖρα (sphaîra, “ball, globe”), of unknown origin. Compare Persian سپهر‎ (sepehr, “sky”)

発音

• (英国発音) IPA^(key): /sfɪə/
• (米国発音) enPR: sfîr, IPA^(key): /sfɪɹ/
• 韻: -ɪə(r)

名詞

sphere (複数形 spheres)

1. (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.].
2. A spherical physical object; a globe or ball. [from 14th c.]
   • (Can we date this quote?) John Milton

     Of celestial bodies, first the sun, / A mighty sphere, he framed.

   • 2011, Piers Sellers, The Guardian, 6 July:

     So your orientation changes a little bit but it sinks in that the world is a sphere, and you're going around it, sometimes under it, sideways, or over it.

3. (astronomy, now まれに) 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.]
   • 1635, John Donne, "His parting form her":

     Though cold and darkness longer hang somewhere, / Yet Phoebus equally lights all the Sphere.

4. (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.]
   • 1603, John Florio, transl.; Michel de Montaigne, The Essayes, […], printed at London: By Val[entine] Simmes for Edward Blount […], OCLC 946730821:
     , vol.1, p.153:

     It is more simplicitie to teach our children […] [t]he knowledge of the starres, and the motion of the eighth spheare, before their owne.

   • 1646, Thomas Browne, Pseudodoxia Epidemica, I.6:

     They understood not the motion of the eighth sphear from West to East, and so conceived the longitude of the Stars invariable.

5. (mythology) An area of activity for a planet; or by extension, an area of influence for a god, hero etc. [from 14th c.]
6. (figuratively) The region in which something or someone is active; one's province, domain. [from 17th c.]
   • 1946, Bertrand Russell, History of Western Philosophy, I.20:

     They thought – originally on grounds derived from religion – that each thing or person had its or his proper sphere, to overstep which is ‘unjust’.

7. (geometry) The set of all points in three-dimensional Euclidean space (または n-dimensional space, in topology) that are a fixed distance from a fixed point [from 20th c.].
8. (logic) The extension of a general conception, or the totality of the individuals or species to which it may be applied.

同意語

• (object): ball, globe, orb
• (region of activity): area, domain, field, orbit, sector
• (in 幾何学): 3-sphere (幾何学), 2-sphere (topology)
• (astronomy: apparent surface of the heavens): See celestial sphere
• (astronomy: anything visible on the apparent surface of the heavens): See celestial body

派生語

• blogosphere
• sphere of influence
• sphere of interest

関連する語

• atmosphere
• hemisphere
• ionosphere
• planisphere
• spherical
• spheroid
• stratosphere
• troposphere

動詞

sphere (三人称単数 現在形 spheres, 現在分詞 sphering, 過去形および過去分詞形 sphered)

1. (transitive) To place in a sphere, or among the spheres; to ensphere.
   • (Can we date this quote?) William Shakespeare

     The glorious planet Sol / In noble eminence enthroned and sphered / Amidst the other.

2. (transitive) To make round or spherical; to perfect.

   (Can we find かつ add a quotation of Tennyson to this entry?)

参考

• ball (in topology)
• Mathworld article on the sphere
• PlanetMath article on the sphere

アナグラム

• Hesper, herpes, pesher, pheers

派生語

アナグラム

• Hesper, herpes, pesher, pheers