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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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 9, 2005
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One fine supersexy mofo.
That fine supersexy mofo must be Mach!
by Sam Spielberg July 7, 2003
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A term used by Ground Support Equipment Marines, mostly by Lewis, used in multiple ways; MACH is Latin for march. the translation was lost thousands of years ago by the Latinians, but fortunatly Greek historians found the translation engraved on a Turkish bike made of stone. Yes there is quite a bit of history behind the word MACH indeed.

Pronounced: MAAAAACH!!!
1) The party at bro skillets house is MACH 15th.
2) Forward, MACH!!
3) Jealous MACH?
4) Are you going to start that fire by lighting that MACH? your definitely going to need more MACHES.
5) Yeah about that.. Im going to have you come in on Saturday... yeahhhh.. MOOCH MACH!!!
6) Skibby: Game set MACH!!
Jonney: AHH! f#k that re-MACH!!
7) thank you very MACH!!
8) Are you going to eat the rest of that turkey sandMACH?
9) I have to go put my clothes in the drier now..................... MAAAAACH!!!!!
by Juz10 March 6, 2008
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69mach1...Nonsexually... but as in the year of the Mustang.
I am going to save up my money and buy that yellow 69mach1 for $3500.
by rubyice August 30, 2005
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A mach is simply a knife. By implication, it's large.
A gat'll get you years. I carry a mach. I can blag it from the kitchen I work at.
by JoeJJ April 17, 2006
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Adj. (Mah-ch) To be full of machismo, to be macho, to be a tool. Is commonly used as a term to describe the actions of males who have very high testosterone levels and feel an obligation to demonstrate their manliness.
"You're acting really mach today."
by The G Master October 20, 2006
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