Definitions

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

  • n. A sharp cutting edge.
  • n. A sharp, narrow edge or border: "saying lines that teeter on the knife-edge between literature and lunacy” ( Vincent Canby).
  • n. A wedge of metal used as a low-friction fulcrum for a balancing beam or lever.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A piece of steel sharpened to an acute edge or angle, and resting on a smooth surface, serving as the axis of motion of a pendulum, scale beam, or other piece required to oscillate with the least possible friction.
  • n. A precarious balance that could be upset by a very small force in either direction.
  • n. Used other than as an idiom: the edge of a knife.

from the GNU version of the Collaborative International Dictionary of English

  • n. A piece of steel sharpened to an acute edge or angle, and resting on a smooth surface, serving as the axis of motion of a pendulum, scale beam, or other piece required to oscillate with the least possible friction.

from The Century Dictionary and Cyclopedia

  • n. The wedge-like piece of steel which serves as the axis on the fine edge of which a scale-beam, a pendulum, or any thing required to oscillate with the least possible friction rests and turns. See balance.

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

  • n. the sharp cutting side of the blade of a knife
  • n. a narrow boundary

Etymologies

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