| M | Mega (10^6) |
| m | Milli (10^-3) |
| M | Million |
| M | Mutual conductance |
| MA | Mechanical Advantage |
| MAC | Multiplexed Analogue Components; MacPaint image format |
| MAC | Maximum Allowable Concentration; Medium Access Control (DVB-RCT) |
| MAC | Message Authentication Code |
| MACT | Maximum Achievable Control Technology |
| MAGRAM | MAGnetic Radar Absorbing Material |
| MAIT | Manufacturers Association for Information Technology |
| MALDI | Matrix-Assisted Laser Desorption and Ionization |
| MAM | Media Asset Management |
| MAN | Metropolitan Area Network |
| MAP | Manufacturing Automation Protocol |
| MAS | Microbeam Analysis Society |
| MASER | Micro-wave Amplification by Stimulated Emission of Radiation |
| MATS | MAterial Transport Segment |
| MAWP | Maximum Allowable Working Pressure |
| MB | Machine Batch; Mega Bytes |
| MBC | Machine Bath Collection |
| MBE | Molecular Beam Epitaxy |
| MBMS | Molecular Beam Mass Spectrometry |
| MBPC | Model-Based Process Control |
| MBTC | Model-Based Temperature Control |
| MBX | Message Bus eXchange |
| MCA | Measurement Capability Analysis |
| MCAD | Mechanical CAD |
| MCAE | Mechanical CAE |
| MCBA | Mean Cycles Between Assists |
| MCBF | Mean Cycles Between Failures |
| MCBI | Mean Cycles Between Interrupts |
| MCBSE | Mean Cycles Between Scrap Event |
| MCD | Magnetic Circular Dichroism; Millicandela |
| MCLR | Medium Capacity Long Range |
| MCM | MultiChip Module; Manufacturing Cycle Management |
| MCM-C | MultiChip Module-Ceramic |
| MCM-D | MultiChip Module-Dielectric |
| MCM-P | MultiChip Module-Plastic |
| MCNS | Multimedia Cable Network System Partners |
| MCP | MultiChip Package |
| MCS | Material Control System |
| MCT | Mercury Cadmium Telluride detector; MOS Controlled Thyristor |
| MCTF | Motion Compensated Temporal Filtering |
| MCU | Microprocessor Control Unit; Mobile Calibration Unit |
| MCVD | Metal Chemical Vapor Deposition |
| MD | Molecular Dynamics; Mini Disk |
| MDL | Minimum Detection Limit; Maximum Doping Limit |
| MDQ | Market Driven Quality |
| MDQW | Modulation Doped Quantum Well |
| MDRAM | Multibank DRAM |
| MDS | Modify Device Status; Multipoint Distribution System; Minimum Detectable Signal |
| MDU | Modular Dispensing Unit |
| MD-MOS | Multi-Drain Metal-Oxide Semiconductor |
| MEBS | Medium Energy Backscattering Spectrometry |
| MED | Modeling for Equipment Design |
| MEE | Migration Enhanced Epitaxy |
| MEIS | Medium Energy Ion Scattering |
| MEM | Micro Electro Mechanical; Manufacturing Enterprise Model |
| MEMS | Micro Electro-Mechanical System |
| MEO | Medium Earth Orbit |
| MER | Modulation Error Ratio |
| MERIE | Magnetically enhanced reactive ion etching |
| MES | Manufacturing execution systems |
| MESC | Modular Equipment Standards Committee; Modular Equipment Sub-Committee for Communications |
| MESFET | Metal Semiconductor FET |
| METL | Multielement two-layer |
| METS | Materials and Equipment Trading Service |
| MEV | Megaelectrovolt |
| MF | Medium frequency |
| MFAST | Mwave Folded Array Signal Transform (IBM) |
| MFC | Mass flow controller |
| MFCC | Maximum Free Carrier Concentration |
| MFD | Multi-Function Devices |
| MFLOPS | Million Floating Point Instructions Per Second |
| MFM | Mass flow meter; Magnetic Force Microscopy |
| MFMIS | Metal Ferroelectric Metal Insulator Semiconductor |
| MFN | Multi-Frequency Network |
| MFP | Mean Free Path |
| MG | Manufactured goods |
| MGC | Manufactured goods collection |
| MHEMT | Metamorphic HEMT |
| MHI | Material hazard index |
| MHP | Multimedia Home Platform |
| MI | Mutual inductance |
| MIC | Monolithic Integrated Circuit |
| MID | Material ID |
| MIDI | Musical Instrument Digital Interface |
| MIDP | Microwave Induced Delayed Phosphorescence |
| MIE | Magnetron ion etching |
| MIGS | Metal-Induced Gap States |
| MIM | Metal-Insulator-Metal |
| MIMAC | Measurement and improvement of manufacturing capacity |
| MIME | Multipurpose Internet Multimedia Extension |
| MIMIC | Microwave & Millimeter (wave) IC (Program) |
| MIMO | Multiple Input Multiple Output |
| MIPS | Million Instructions Per Second |
| MIR | Moisture insulation resistance |
| MIS | Metal insulator silicon; Metal insulator semiconductor |
| MISFET | Metal Insulator Semiconductor FET |
| MISO | Multiple Input Single Output |
| MIT | Metal Insulator Transition |
| MITI | Ministry of International Trade and Industry (Japan) |
| ML | Mono Layer |
| MLB | Multi Layer Board |
| MLC | Multi-Level Cell; Multi Layer Capacitor |
| MLCC | MultiLayer Ceramic Capacitors |
| MLM | Multilevel metal |
| MLP | Multi-Layer Perceptron; Micro Leadframe Package |
| MLPWB | Multi layer printed wiring board |
| MLR | Message log report |
| MLV | Modify logging versions |
| MM | Manufacturing Methods |
| MMC | Manufacturing Methods Council; Maximum material condition |
| MMD | Microlithographic Mask Development program |
| MMDS | Multichannel Multipoint Distribution Service |
| MMF | Magneto Motive Force |
| MMIC | Monolithic Microwave Integrated Circuit |
| MMM | Material movement management; Magnetism and Magnetic Materials |
| MMMC | Machine material movement component |
| MMMS | Material Movement Management Standard |
| MMO | Multimodel optimization |
| MMOS | Modified MOS |
| MMPS | Multichannel Multi Port Distribution System |
| MMS | Multimedia Mesaging |
| MMS | Windows Media Technology's transport protocol; Multimedia Messaging Service |
| MMST | Microelectronics Manufacturing Science and Technology |
| MMU | Memory Management Unit |
| MMX | Multimedia Extension |
| MNDO | Modified Neglect of Diatomic Overlap |
| MNOS | Metal-nitride-oxide semiconductor |
| MNS | Metal-nitride semiconductor |
| MO | Metal-organic |
| MOCVD | MetalOrganic Chemical Vapor Deposition |
| MOD | Magneto Optical Disc |
| MODEM | Modulator-Demodulator |
| MODFET | MOdulation Doped Field Effect Transistor |
| MOM | Method Of Moments |
| MOMBE | Metal-Organic Molecular Beam Epitaxy |
| MONET | Multi-wavelength Optical NETwork |
| MONOS | Metal Oxide Nitride Oxide |
| MOP | Modify Operating Procedures |
| MORIE | MetalOrganic Reactive Ion Etching |
| MOS | Metal Oxide Semiconductor |
| MOSFET | Metal oxide semiconductor field effect transistor |
| MOS-C | Metal Oxide Semiconductor Capacitor |
| MOT | Magneto Optical Trap |
| MOT | Multimedia Object Transfer |
| MP | Multi Phonon; Melting point; Massively parallel |
| MPA | Microwave Power Absorbtion |
| MPEG | Moving Pictures Experts Group |
| MPF | Mobile Payment Forum |
| MPG | Magnetic Pulse Generator |
| MPL | Magneto Photo Luminescence; Multilevel pass transistor logic |
| MPLS | Multiprotocol Label Switching |
| MPM | Microwave Power Module |
| MPP | Multiphase printing |
| MPRES | Modular plasma reactor simulator |
| MPSA | Mobile Payment Services Association |
| MPTS | Multi-Program Transport Stream |
| MPU | Microprocessor unit |
| MPW | Multi-Product Wafer |
| MPX | Multiplex |
| MP-OES | Multi-point optical emission spectroscopy |
| MQW | Multiple Quatum Well |
| MQ-NMR | Multiple Quantum NMR |
| MR | Magnetic resonance; Magneto resistive |
| MRAM | Magnetic Random Access Memory |
| MRI | Magnetic Resonance Imaging |
| MRP | Materials requirements planning; Manufacturing resource planning |
| MRS | Materials Research Society |
| MS | Mass spectrometry; Mass spectrometer; Mass spectroscopy |
| MS | Mobile Station |
| MSA | Microscopy Society of America |
| MSB | Most Significant Bit |
| MSC | Mobile Switching Centre |
| MSDC | MultiStage Depressed Collector |
| MSDS | Material Safety Data Sheet |
| MSEM | Metrology Specific Equipment Model |
| MSG | Management Steering Group |
| MSHA | Mine Safety and Health Administration |
| MSI | Medium-scale integration; manufacturing support item |
| MSIC | Medium scale integrated circuit |
| MSL | Modify system logging |
| MSM | Metal-Semiconductor-Metal |
| MSO | Multiple Systems Operator |
| MSP | Microsoft Paint image format |
| MSS | Mobile Satellite Service |
| MSS | Modify system state; Modulation semiconductor structure |
| MST | Micro System Technology |
| MSTAB | Manufacturing Systems Technical Advisory Board |
| MTBA | Mean time between assists |
| MTBAP | Mean (productive) time between assists |
| MTBCF | Mean Time Between Critical Failures |
| MTBF | Mean Time Between Failures |
| MTBFP | Mean (Productive) Time Between Failures |
| MTBI | Mean Time Between Interrupt; Mean Time Between Incident |
| MTI | Moving Target Indicator |
| MTOL | Mean Time Off Line; Mean Time On Line |
| MTS | Material Tracking Standard |
| MTSC | Memory Time Switch CMOS |
| MTSL | Memory Time Switch Large |
| MTSS | Memory Time Switch Small |
| MTT | Mail TrusT |
| MTTA | Mean Time To Assist |
| MTTC | Mean Time To Correct |
| MTTF | Mean Time To Failure |
| MTTR | Mean Time To Repair |
| MUART | Multiple UART |
| MUART | Multifunctions Universal Asynchronous Receiver Transmitter |
| MUDEM | MUltiplexer/DEMultiplexer |
| MUL | Modify User Login |
| MUNICH | Multi-channel Network Interface Controller |
| MUP | Modify User Password |
| MUSAC | Multipoint Switching And Conferencing Unit |
| MUSAC-A | Multipoint Switching And Conferencing Unit Attenuation |
| MV | Mega Volt |
| MVC | Model View Controller |
| MVDS | Multipoint Video Distribution Service |
| MVTR | Moisture Vapor Transmission Rate |
| MW | Molecular Weight; MegaWatt; MicroWave |
| MWBC | Mean Wafers Between Cleans |
| MWT | Monitor Wafer Turner |
| mA | Milliampere |
| mag | Magnetron |
| max | Maximum |
| mH | Millihenry |
| min | Minimum |
| mm | Millimeter |
| mmwave | Millimeter Wave |
| mrad | milliradian |
| ms | millisecond |
| Mux | Multiplexer |
| mV | Millivolt |
| mW | Milliwatt |
