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1. (n.) roller coaster
a small railroad, esp. in an amusement park, having a train with open cars that moves along a high, sharply winding trestle built with steep inclines.
2. roller coaster
any phenomenon, period, or experience characterized by violent ups and downs or fluctuations.
Etymology: (1885–90)
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| Definition of 'roller coaster' |
Princeton's WordNet |
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1. (noun) roller coaster
anything characterized by abrupt and extreme changes (especially up and down)
"the economy has been on a roller coaster all year"
2. (noun) roller coaster, big dipper, chute-the-chute
elevated railway in an amusement park (usually with sharp curves and steep inclines)
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1. (noun) roller coaster
a ride at a fair on which cars roll on a track of hills and loops
Do you want to ride the roller coaster?
2. roller coaster
a situation that changes frequently and unpredictably
It was a real roller coaster - he was in and out of the hospital five times.
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Definitions of roller coaster 
