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Definition of mach

mach

/mɑːk/
mach
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mach Lexical Profile

mach Game Scores & Validity

• noun

1

A dimensionless ratio representing the speed of an object moving through a fluid divided by the local speed of sound under the same atmospheric conditions (typically capitalized and followed by a numeral).

Example

"The experimental aircraft was designed to cruise comfortably at speeds exceeding Mach 2."

Synonyms
View all synonyms for mach

Word Nuance & Usage

When indicating a specific speed, "Mach" precedes the numeral (e.g., "Mach 2") rather than following it like standard units of measurement.

• Rhymes for mach

• Nearby Words

maccoa
macdonnell
mace
mach
mache
machete
machine

Word Origin & Etymology

Coined in 1929 by the Swiss aeronautical engineer Jakob Ackeret in honor of the Austrian physicist and philosopher Ernst Mach (1838–1916), who conducted pioneering research on supersonic fluid dynamics and shock waves.

Cite this Entry

Wordmom. (2026). Definition of Mach. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/mach
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