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Pronunciation varies by accent · adjective
(aviation) Of a speed, equal to, or greater than, or capable of achieving, five times the speed of sound..
He said there was worry among intelligence and military officials that China or Russia could be experimenting with hypersonic technology.
Use hypersonic when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Hypersonic means (aviation) Of a speed, equal to, or greater than, or capable of achieving, five times the speed of sound..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
He said there was worry among intelligence and military officials that China or Russia could be experimenting with hypersonic technology.
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