Definition of "sphere"

sphere

/sfɪə(ɹ)/

noun
plural 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 .
2. A spherical physical object; a globe or ball.
  Quotations
  Of celestial bodies, first the sun, / A mighty sphere, he framed.
  1667, John Milton, “Book VII”, in Paradise Lost. […], London: […] [Samuel Simmons], […]; republished as Paradise Lost in Ten Books: […], London: Basil Montagu Pickering […], 1873,
  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.
  2011 July 6, Piers Sellers, The Guardian
3. (astronomy, now rare) The celestial sphere: the edge of the heavens, imagined as a hollow globe within which celestial bodies appear to be embedded.
  Quotations
  Though cold and darkness longer hang somewhere, / Yet Phoebus equally lights all the Sphere.
  1635, John Donne, His parting form her
  Resistless rolls the illimitable sphere, / And one great circle forms the unmeasured year.
  1791, Erasmus Darwin, The Economy of Vegetation, J. Johnson, page 190
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).
  Quotations
  ſooner ſhall the Sun fall from his Spheare,Than Tamburlaine be ſlaine or ouercome.
  c. 1587–1588, [Christopher Marlowe], Tamburlaine the Great. […] The First Part […], 2nd edition, part 1, London: […] [R. Robinson for] Richard Iones, […], published 1592; reprinted as Tamburlaine the Great (A Scolar Press Facsimile), Menston, Yorkshire, London: Scolar Press, 1973, (please specify the page)
  It is more simplicitie to teach our children […] [t]he knowledge of the starres, and the motion of the eighth spheare, before their owne.
  1603, Michel de Montaigne, translated by John Florio, The Essayes […], book 1, London: […] Val[entine] Simmes for Edward Blount […], page 153
  They understood not the motion of the eighth sphear from West to East, and so conceived the longitude of the Stars invariable.
  1646, Thomas Browne, Pseudodoxia Epidemica, I.6
5. (mythology) An area of activity for a planet; or by extension, an area of influence for a god, hero etc.
6. (figuratively) The region in which something or someone is active; one's province, domain.
  Quotations
  ...while his sweet and gentle niece would be a charming companion for Francesca; and he thought, with a glow of affection long unfelt, that Lucy Aylmer must inevitably make a friend whose future kindness might add much to her happiness. Both were at present placed out of their sphere: but the one would in all probability have it greatly in her power to cherish and aid the other.
  1834, L[etitia] E[lizabeth] L[andon], chapter XVIII, in Francesca Carrara. […], volume II, London: Richard Bentley, […], (successor to Henry Colburn), page 203
  They thought – originally on grounds derived from religion – that each thing or person had its or his proper sphere, to overstep which is ‘unjust’.
  1946, Bertrand Russell, History of Western Philosophy, I.20
7. The natural, normal, or proper place (of something).
8. (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 .
9. (logic, dated) The domain of reference of a proposition, subject, or predicate, or the totality of the particular subjects to which it applies.
  Quotations
  In point of fact, so often as we think a subject as partially included within the sphere of a predicate, eo ipso we think it as partially, that is, particularly, excluded therefrom.
  a. 1856, William Hamilton, “Appendix III: Quantification of Predicate,—Immediate Inference,—Conversion,—Opposition”, in Lectures on Metaphysics and Logic, volume 2, published 1860, page 526
  All categorical propositions necessarily imply the existence of their subjects in the appropriate sphere; in affirmative propositions this involves the existence of the predicate in the same sphere; but in negative propositions the predicate does not necessarily exist in that particular sphere, though it does in some sphere.
  1896, James Welton, A Manual of Logic, 2nd edition, volume 1, page 213
  Finally, the disjunctive judgment contains a relation of two or more propositions to each other—a relation not of consequence, but of logical opposition, in so far as the sphere of the one proposition excludes that of the other.
  1900 , Immanuel Kant, translated by J. M. D. Meiklejohn, Critique of Pure Reason, page 58
verb
third-person singular simple present spheres, present participle sphering, simple past and past participle sphered
1. (transitive) To place in a sphere, or among the spheres; to ensphere.
  Quotations
  The glorious planet Sol / In noble eminence enthroned and sphered / Amidst the other.
  c. 1602, William Shakespeare, “The Tragedie of Troylus and Cressida”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act I, scene iii]
  Sphere all your lights around, above;⁠Sleep, gentle heavens, before the prow;⁠Sleep, gentle winds, as he sleeps now,My friend, the brother of my love.
  1850, [Alfred, Lord Tennyson], In Memoriam, London: Edward Moxon, […], canto IX
2. (transitive) To make round or spherical; to perfect.
  Quotations
  sphered Whole
  1847, Alfred Tennyson, “(please specify the page number, or |part=Prologue, I to VII, or conclusion)”, in The Princess: A Medley, London: Edward Moxon, […]

Definition of "sphere"

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