Hypersonic
/hˌaɪpəˈrsɑnɪk/
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Definition
(adj) Of a speed, equal to, or greater than, or capable of achieving, five times the speed of sound.
Sentence Examples
The United States has no defense against hypersonic missiles.
The United States has no defense against hypersonic weapons.
CEFR Practice Quiz
The experimental aircraft reached ____ speeds, traveling much faster than the speed of sound.