Mach number

noun
\ ˈmäk- How to pronounce Mach number (audio) \

Definition of Mach number

: a number representing the ratio of the speed of a body (such as an aircraft) to the speed of sound in a surrounding medium (such as air)

First Known Use of Mach number

1937, in the meaning defined above

History and Etymology for Mach number

Ernst Mach †1916 Austrian physicist

Keep scrolling for more

Learn More about Mach number

Time Traveler for Mach number

Time Traveler

The first known use of Mach number was in 1937

See more words from the same year

Statistics for Mach number

Cite this Entry

“Mach number.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Mach%20number. Accessed 22 Jan. 2021.

Keep scrolling for more

More Definitions for Mach number

Mach number

noun
\ ˈmäk- How to pronounce Mach number (audio) \

Medical Definition of Mach number

: a number representing the ratio of the speed of a body to the speed of sound in a surrounding medium (as air) a Mach number of 2 indicates a speed that is twice that of sound

Comments on Mach number

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

WORD OF THE DAY

Test Your Vocabulary

Slippery Words Quiz—Changing with the Times

  • ducreux self portrait yawning
  • What is an earlier meaning of nice?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

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!