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roller coaster definition

☆ roller coaster

  1. an amusement ride in which small, open cars move on tracks that dip and curve sharply
  2. something, as a situation, relationship, or series of events, characterized by frequent abrupt and unpredictable change

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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