Definition of mach

 (Entry 1 of 3)

Mach

noun
\ ˈmäk How to pronounce Mach (audio) \

Definition of Mach (Entry 2 of 3)

: a usually high speed expressed by a Mach number an airplane flying at Mach 2

Mach

biographical name
\ ˈmäḵ How to pronounce Mach (audio) , ˈmäk \

Definition of Mach (Entry 3 of 3)

Ernst 1838–1916 Austrian physicist and philosopher

First Known Use of mach

Noun

1946, in the meaning defined above

History and Etymology for mach

Noun

Mach number

Keep scrolling for more

Learn More about mach

Statistics for mach

Cite this Entry

“Mach.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mach. Accessed 27 Oct. 2020.

Keep scrolling for more

More Definitions for mach

Mach

noun
How to pronounce Mach (audio)

English Language Learners Definition of Mach

technical used to indicate the high speed of something (such as an airplane) by comparing it to the speed of sound

Mach

noun
\ ˈmäk How to pronounce Mach (audio) \

Medical Definition of Mach

: a usually high speed expressed by a Mach number an airplane flying at Mach 2

More from Merriam-Webster on mach

Nglish: Translation of mach for Spanish Speakers

Britannica English: Translation of mach for Arabic Speakers

Comments on mach

What made you want to look up mach? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Namesakes Word Quiz

  • a citrus fruit possibly named after a person
  • Which of the following is a fruit named after a Moroccan seaport?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!