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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

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

Most people just mach down Main Street, the obvious open face; traverse skier�s right into Hunziker Bowl for a tighter, steeper line.

From Time Magazine Archive

After making prodigious havock in many other places, Alfonzo returned to Columbo with mach spoil and many prisoners.

From A General History and Collection of Voyages and Travels — Volume 06 Arranged in Systematic Order: Forming a Complete History of the Origin and Progress of Navigation, Discovery, and Commerce, by Sea and Land, from the Earliest Ages to the Present Time by Kerr, Robert