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- (of a speed, aviation) Equal to, or greater than, or capable of achieving, five times the speed of sound.
- 2021 June 3, Julian E. Barnes; Helene Cooper, “U.S. Finds No Evidence of Alien Technology in Flying Objects, but Can’t Rule It Out, Either”, in The New York Times, ISSN 0362-4331:
- He said there was worry among intelligence and military officials that China or Russia could be experimenting with hypersonic technology.
- (of a speed, aeronautics) Far enough above the speed of sound as to cause significant differences in behaviour due to chemical reactions or dissociation of the air.
five times the speed of sound