from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An effective quality or element.
  • noun The position of greatest advancement or importance; the forefront.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun the sharp edge of the blade of a knife or other cutting tool
  • noun idiomatic (by extension) the forefront, or position of greatest advancement in some field
  • adjective Alternative form of cutting-edge.

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

  • noun the position of greatest importance or advancement; the leading position in any movement or field
  • noun the sharp cutting side of the blade of a knife


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