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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

A "mach meter," an aerial speedometer, in view of passengers in the first few rows reached mach 1.

From Time Magazine Archive

Tenants then have as mach right as the landlord used to have.

From Roland Cashel Volume II (of II) by Charles James Lever

The jet is the world’s fastest purpose-built business jet which can reach top speeds of Mach 0.95 with a range of 8,000 nautical miles.

From The Wall Street Journal ● Jul. 30, 2026

The first dates to the 1880s and was introduced by physicist Ernst Mach.

From Science Daily ● Jul. 17, 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

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

Jackie was one of the only American women to fly military jets and had even been the first woman to break the sound barrier—flying faster than the speed known as Mach 1—in 1953.

From "Women in Space" by Karen Bush Gibson