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

  • noun An act of overcoming or penetrating an obstacle or restriction.
  • noun A military offensive that penetrates an enemy's lines of defense.
  • noun A major achievement or success that permits further progress, as in technology.

from the GNU version of the Collaborative International Dictionary of English.

  • noun a productive insight.
  • noun a sudden change of situation, such as making an important discovery, that permits further rapid advances toward a goal.
  • noun (Mil.) a penetration of an enemy's defense in depth and strength.

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

  • adjective Characterized by major progress or overcoming some obstacle.
  • noun military An advance through and past enemy lines (or vice versa).
  • noun Any major progress; such as a great innovation or discovery that overcomes a significant obstacle.
  • noun sports The penetration of the opposition defence

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

  • noun making an important discovery
  • noun a productive insight
  • noun a penetration of a barrier such as an enemy's defense
  • verb break out
  • verb penetrate
  • verb pass through (a barrier)


from Wiktionary, Creative Commons Attribution/Share-Alike License

break +‎ through


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