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2 definitions found
 for roller coaster
From The Collaborative International Dictionary of English v.0.48 :

  Roller coaster \Roller coaster\
     An amusement railroad of varying design in which open cars
     coast by gravity over a long winding track in a closed
     circuit, with steep pitches and ascents, and in some cases
     loops in which the cars are briefly upside-down; typically,
     the cars are pulled by a chain device to the top of the first
     peak, after which gravity and momentum provide the only
     propulsive forces. In some cases, the cars are suspended from
     a monorail rather than resting on a track, and such cars may
     be made to swing outward at an angle near to the horizontal.
     It is a popular amusement at many amusement parks, but is
     sufficiently frightening to some people that they refuse to
     ride in one.
     [Webster 1913 Suppl. +PJC]

From WordNet (r) 3.0 (2006) :

  roller coaster
      n 1: anything characterized by abrupt and extreme changes
           (especially up and down); "the economy has been on a roller
           coaster all year"
      2: elevated railway in an amusement park (usually with sharp
         curves and steep inclines) [syn: roller coaster, big
         dipper, chute-the-chute]

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