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Meaning:
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(of speed) faster that that of sound; (of a plane) able to fly at supersonic speed

fast, quick

accelerated brisk expeditious hasty hurried immediate prompt rapid swift agile alacritous breakneck express fleet harefooted headlong lissome lively nimble precipitate quick-fire rapid-fire ready snappy summary supersonic ultrasonic winged
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1) (of speed) faster that that of sound; (of a plane) able to fly at supersonic speed (supersonic)

SUPERSONIC as in Wiktionary
SUPERSONIC as in Wikipedia