1 Speed Of Sound Crossword Clue — 4 Letters

One confident answer with explanation of the wordplay

MACH
Best match
M
A
C
H

Mach 1 refers to the speed of sound, named after physicist Ernst Mach. 'Mach 1' is the standard term for traveling at the speed of sound.

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Other possible answers
WARPWarp speed is a sci-fi concept but not specifically tied to 'speed of sound'
KNOTA unit of speed but not specifically associated with '1 = speed of sound'

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