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• mach
  mach

  noun

  mach number.
• Mach
  Mach

  noun

  Ernst 1838–1916, Austrian physicist, psychologist, and philosopher.
• mach.
  mach.

  abbreviation

  machine.

mach

¹ American  

[mahk] / mɑk /

Or Mach

noun

1. mach number.

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Mach ² American  

[mahk, mahkh] / mɑk, mɑx /

noun

1. Ernst 1838–1916, Austrian physicist, psychologist, and philosopher.

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mach. ³ American  

abbreviation

1. machine.

2. machinery.

3. machinist.

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Mach ¹ British  

/ mæk /

noun

1. short for Mach number

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Mach ² British  

/ max /

noun

1. Ernst (ɛrnst). 1838–1916, Austrian physicist and philosopher. He devised the system of speed measurement using the Mach number. He also founded logical positivism, asserting that the validity of a scientific law is proved only after empirical testing

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Mach Scientific  

/ mäk,mäkh /

1. Austrian physicist and philosopher who experimented with supersonic projectiles and the flow of gases, obtaining early photographs of shock waves and gas jets. His work laid an important foundation for later developments in the science of projectiles and aeronautical design, and the Mach number and Mach bands were named for him.

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Usage

How fast is Mach 1? A Mach number is the ratio of an object's speed in a given medium to the speed of sound in that medium. Mach 1, then, is the speed of sound, around 761 mph at sea level on a standard day. The term is also used as a metaphor for high speeds more generally. How to pronounce Mach 1[ mahk wuhn ]

Etymology

Origin of mach

After Ernst Mach

Example Sentences

See Examples For:

mach Mach

After the results, Bhattacharya said, the BJP would send "different kinds of small fish" to Banerjee's house and invite her party workers over for mach bhaat, Bengali for fish and rice.

From BBC ● Apr. 20, 2026

Air Force Captain Kristin "BEO" Wolfe performs the "high-speed pass" maneuver at approximately .95 mach, which is just below the speed of sound, at the 2020 Fort Lauderdale Air Show in Fort Lauderdale, Florida, U.S.

From Reuters ● Nov. 16, 2021

I will be curious to see what mach his framework has achieved by then.

From Forbes ● Mar. 10, 2013

Sponsors of the experiment were engineers from the Stanley Aviation Corp., which is building the escape capsule for the Air Force's new mach 2 bomber, the B58 Hustler.

From Time Magazine Archive

On returning to my Chamber I spent a pleasant hour planing my maid-of-honor gown, which I considered might be blue to mach my eyes, with large pink hat and carrying pink flours.

From Bab: a Sub-Deb by Rinehart, Mary Roberts

Larry Ryan drives a 2021 Mustang Mach E but his “wife refuses to ride in the car on any trips over 150 miles for fear of running out of charge.”

From The Wall Street Journal ● Jul. 11, 2026

El Segundo-based industrial supplies company Advanced Manufacturing Company of America and Huntington Beach-based aerospace company Mach Industries each raised $300 million.

From Los Angeles Times ● Jul. 10, 2026

Hypersonic means Mach 5—five times the speed of sound.

From The Wall Street Journal ● Jun. 14, 2026

California defense tech startup Mach Industries said Tuesday it raised $300 million, nearly quadrupling the company’s valuation to $1.8 billion within a year.

From Los Angeles Times ● Jun. 3, 2026

Their rockets had reached speeds of Mach 15 in flight, and they were confident of their abilities to lift a payload—a satellite and a human passenger—into orbit.

From "Hidden Figures" by Margot Lee Shetterly