Crossword puzzle clue "sound speed number"

Here are the possible solutions for sound speed number clue

Answer
Clue
Relevancy
mach
Clue
Speed-of-sound number
Speed of sound number
Sound-speed number
Sound-speed ratio number
Jet speed number
Definition
a number relating the speed of a body to the speed of sound
sonicboom
Clue
Sound of a plane flying faster than the speed of sound
asimov
Clue
Writer who said "I am not a speed reader. I am a speed understander"
limit
Clue
Speed ___ (number on a highway sign)
Definition
to restrict

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