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Definition of Roller coaster
1. Noun. Anything characterized by abrupt and extreme changes (especially up and down). "The economy has been on a roller coaster all year"
2. Noun. Elevated railway in an amusement park (usually with sharp curves and steep inclines).
Exact synonyms: Big Dipper, Chute-the-chute
Generic synonyms: El, Elevated, Elevated Railroad, Elevated Railway, Overhead Railway, Ride
Specialized synonyms: Hypercoaster
Generic synonyms: El, Elevated, Elevated Railroad, Elevated Railway, Overhead Railway, Ride
Specialized synonyms: Hypercoaster