disruptive technology
n. A new product or service that disrupts an industry and eventually wins most of the market share.

Example Citation:
"What is a disruptive technology? Christensen coined the term in his best seller, The Innovator's Dilemma, published in 1997, and it has since become the hottest buzzword in business today as the Merrill Lynches react to the E-Trades. It's nothing new. Japanese automakers used disruptive technology in the 1970s to seize market share. A disruptive technology is often an inferior product or service, but one good enough to win wide swaths of market share."
—Del Jones, "Will business schools go out of business?," USA Today, May 23, 2000

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