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a speed relative to the speed of sound Mach number is a ratio of the speed of a body (aircraft) to the speed of sound)
Mach is named after Ernst Mach an Austrian philosopher and physicist.
Mach 1 is about 717mph Mach 2 is twice that. The speed of sound varies due to atmospheric conditions and density of the air.
Most commercial airliners fly below Mach 1
by Snipergod87 May 11, 2006
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May 15 Word of the Day
A few weeks ago, no one had β€œcheugy” in their vocabulary . Now everything is saturated with the word. It’s in our heads. It’s in our homes. Everyone is asking: β€œAm I cheugy? Am I a basic ass bitch? Am I GUILTY of being cheugy?”

The proliferation of cheugy in the mainstream discourse can only be attributed to one source: mental terror. It’s an orchestrated psychological trap to make you question your tastes and interests in the eyes of others.

You are not a cheug. YOU’RE PERFECT!!!!

It is very suspicious that the cheugy mascot is a Minion, a literal cyclops, a deformed
yellow panopticon in overalls ... do not let the all-seeing eye to control you. Be vigilant. Resist cheugy psyops.
Becca is another victim of cheugy psyops. I saw the garbage truck take all her Ugg boots yesterday. She even removed β€œI LOVE The Office!” from all her dating profiles. She’s unrecognizable.
via giphy
by Callmemaybe69 May 12, 2021
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2
(noun) 1. A measurement of sound 2. An expression of approval used commonly by Mrs. Kelly.
As the plane reached Mach 3, Mrs Kelly watched from the ground and exlaimed, "Mach, this haggas is greht!"
by HuFlungPu May 25, 2008
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3
everything,
It is the greatest thing ever,
often it is used as a prefix, followed by the suffix, Hach.
Mach Hach 2011 was Mach'n awsome Hach?????
by Mach Hacher 1 August 17, 2011
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4
Hip; cool; sleek and captivating, noveau
His dinner jacket sucked, so he hiked up the sleeves of them to reveal a wrist watch that was totally mach.
by Maestro Max February 09, 2005
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5
One fine supersexy mofo.
That fine supersexy mofo must be Mach!
by Sam Spielberg July 07, 2003
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6
v. To own completely, derived from the image of an F-18 Fighter Jet overtaking a Cessna. Never spelled with an "e" in the past tense, the e is replaced with an apostrophe.
*F-18 buzzes pedestrians at about 15 feet above the ground, teeth shatter*

Pilot: "MACH'D!!"
by Geoff T. February 21, 2008
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