Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Mathematics A line segment that joins the origin and a variable point in a system of polar or spherical coordinates.
  • n. Mathematics The length of such a line segment.
  • n. Astronomy A straight line connecting the center of the sun or another body with the center of a planet, comet, or other body orbiting around it.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A straight line (or the length of such line) connecting any point, as of a curve, with a fixed point, or pole, round which the straight line turns, and to which it serves to refer the successive points of a curve, in a system of polar coordinates.
  • n. An ideal straight line joining the center of an attracting body with that of a body describing an orbit around it, as a line joining the sun and a planet or comet, or a planet and its satellite.

from the GNU version of the Collaborative International Dictionary of English

  • A straight line (or the length of such line) connecting any point, as of a curve, with a fixed point, or pole, round which the straight line turns, and to which it serves to refer the successive points of a curve, in a system of polar coördinates. See coördinate, n.
  • An ideal straight line joining the center of an attracting body with that of a body describing an orbit around it, as a line joining the sun and a planet or comet, or a planet and its satellite.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a line connecting a satellite to the center of the body around which it is rotating
  • n. a line connecting a point in space to the origin of a polar coordinate system

Etymologies

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Examples

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