a unit for measuring the speed of an object such as an aircraft in comparison with the speed of sound. For example, Mach 5 is five times the speed of sound.
Synonyms and related words
Units for measuring speed of movement
acceleration
knot
kph
Mach
noun countable science
US /mɑk/
Word Forms
singular
Mach
plural
Machs
DEFINITIONS1
1
a unit for measuring the speed of an object such as an aircraft in comparison with the speed of sound. For example, Mach 5 is five times the speed of sound.