WordNet (r) 3.0 (2006):

Mach
    n 1: Austrian physicist and philosopher who introduced the Mach
         number and who founded logical positivism (1838-1916) [syn:
         Mach, Ernst Mach]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

MACH
       Multilayer ACtuator Head


The Free On-line Dictionary of Computing (30 December 2018):

Mach

   An operating system kernel under development at
   Carnegie-Mellon University to support distributed and parallel
   computation.  Mach is designed to support computing
   environments consisting of networks of uniprocessors and
   multiprocessors.  Mach is the kernel of the OSF/1.