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

  • n. An angle formed by the perpendicular intersection of two straight lines; an angle of 90°.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An angle of 90 degrees; the bisect of the angle formed by a single straight line.
  • n. An ∟ character.

from the GNU version of the Collaborative International Dictionary of English

  • adj. A spherical angle included between the axes of two great circles whose planes are perpendicular to each other.
  • n. one formed by a right line falling on another perpendicularly, or an angle of 90° (measured by a quarter circle).

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

  • n. the 90 degree angle between two perpendicular lines


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