mark - mete
- marker
- mass coefficient of absorption
- mass flowmeter
- mass resistivity
- mass separator
- mass spectrogram
- mass spectrograph
- mass spectrographic analysis
- mass spectrometry
- mass-impregnated insulation
- mast
- master control
- master control system
- master pulse
- master relay
- master section
- master station
- master substation
- master switch
- mat
- matched load
- matched termination
- matched-load power
- matching circuit
- matching section
- mate
- mating
- mating contact
- matrix commutator
- maximum allowable operating pressure
- maximum capacity of a power station
- maximum capacity of a unit
- maximum continuous operating temperature
- maximum continuous rating
- maximum credible accident
- maximum cutoff
- maximum deflection
- maximum demand
- maximum demand indicator
- maximum demand meter
