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: a usually high speed expressed by a Mach number
an airplane flying at Mach 2
Examples of mach in a Sentence
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Noun
The Pentagon said on Thursday that a common hypersonic All Up Round (AUR) missile, which can fly at Mach 17—equal to 12,940 miles per hour or 17 times the speed of sound, was fired from a U.S. Army's launcher at Cape Canaveral Space Force Station in Florida.
—Thomas G. Moukawsher, Newsweek, 17 Dec. 2024
The missile launch struck a military command center in Ukraine, Putin claimed, saying the missile could reach speeds of Mach 10, or more than 7,000 mph.
IRBMs can reach targets up to 3,500 miles away.
—Brad Dress, The Hill, 11 Dec. 2024
Brandenburg completed the eighth and most recent flight of the XB-1 on Nov. 16, reaching an altitude of 25,000 feet and a speed of Mach 0.82.
—J. George Gorant, Robb Report, 5 Dec. 2024
Shop these Hoka Women's Mach 6 sneakers for $112 or the Hoka Men's Clifton 9 for $116.
—Amelia McBride, Travel + Leisure, 2 Dec. 2024
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Word History
Etymology
Noun
Mach number
Phrases Containing mach
Dictionary Entries Near mach
Cite this Entry
“Mach.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mach. Accessed 21 Dec. 2024.
Kids Definition
Mach
nounMedical Definition
Mach
noun
: a usually high speed expressed by a Mach number
an airplane flying at Mach 2
Biographical Definition
More from Merriam-Webster on mach
Nglish: Translation of mach for Spanish Speakers
Britannica English: Translation of mach for Arabic Speakers
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