: a usually high speed expressed by a Mach number
an airplane flying at Mach 2
Examples of mach in a Sentence
Recent Examples on the Web
Lora Kolodny, CNBC, 22 May 2026
The next phase of the program could involve mounting the experimental aircraft onto a sounding rocket or similar launch vehicle for a real-world Mach 5 flight demonstration.
—Atharva Gosavi, Interesting Engineering, 19 May 2026
Putin has claimed that Oreshnik’s multiple warheads plunge at speeds of up to Mach 10 and can’t be intercepted, and that several such missiles used in a conventional strike could be as devastating as a nuclear attack.
—ABC News, 18 May 2026
In March, engineers at NASA's Jet Propulsion Laboratory (JPL) in Southern California completed tests on rotor designs that could be used to fly those drones, spinning the experimental helicopter blades fast enough for their tips to exceed Mach 1 (the speed of sound).
—Josh Dinner, Space.com, 17 May 2026
See All Example Sentences for mach
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Noun
After flying at a speed of Mach 7, Starship lit two of its engines before splashing down vertically in the Indian Ocean.
—Lora Kolodny, CNBC, 22 May 2026
The next phase of the program could involve mounting the experimental aircraft onto a sounding rocket or similar launch vehicle for a real-world Mach 5 flight demonstration.
—Atharva Gosavi, Interesting Engineering, 19 May 2026
Putin has claimed that Oreshnik’s multiple warheads plunge at speeds of up to Mach 10 and can’t be intercepted, and that several such missiles used in a conventional strike could be as devastating as a nuclear attack.
—ABC News, 18 May 2026
In March, engineers at NASA's Jet Propulsion Laboratory (JPL) in Southern California completed tests on rotor designs that could be used to fly those drones, spinning the experimental helicopter blades fast enough for their tips to exceed Mach 1 (the speed of sound).
—Josh Dinner, Space.com, 17 May 2026
See All Example Sentences for mach
Cite this Entry
“Mach.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mach. Accessed 25 May. 2026.
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Mach
nounMedical Definition
Mach
noun
: a usually high speed expressed by a Mach number
an airplane flying at Mach 2
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