- M-
- m-
- M3U (.m3u)
- Macro
- Magnetic Field
- mA
- mAh
- Major Trading Area
- Mammatocumulus
- MAN
- Mare's Tail
- MARS
- Matrix
- Matrix Array
- Matrix Metering
- Maxwell
- MB
- Mb
- mb
- Mbps
- MD™
- Mean Temperature
- Mebi- (Mi-)
- Mega- (M-)
- Megabit
- Megabyte
- Megahertz
- Megapixel
- Megohm
- Melting Point
- Memory Card
- Memory Effect
- Memory Stick
- Mercury Barometer
- Mercury, Inches of
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- Mesh
- Mesopause
- Mesosphere
- Metal
- Metal-film Resistor
- Metal-Oxide Resistor
- Metal-Particle
- Metal-Oxide Semiconductor Field-Effect Transistor
- Meteorology
- Meter
- Metering
- Metric Prefixes
- Metropolitan Area Network
- Metropolitan Statistical Area
- MHz
- Mi-
- Mic-level
- Micro- (µ)
- Microampere (µA)
- Microbarograph
- Microbrowser
- Microcontroller
- Microfarad
- Microphone
- Microphone, Boundary
- Microphone, Capacitor
- Microphone, Carbon
- Microphone, Electret
- Microphone, Lavalier or Lavaliere
- Microphone, Surface
- Microwave
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- Microwave Multi-point Distribution System
- Middle Clouds
- Midrange
- Mile, Nautical
- Military Affiliate Radio Service
- Milli- (m-)
- Milliamp
- Milliamp-Hours
- Millibar
- Millihenry (mH)
- Milliwatt (mW)
- MIME
- MIN
- Mineralized Ground
- MiniDisc
- Mist
- Mixer
- MMC
- MMDS
- MMS
- Mobile
- Mobile Coverage Area
- Mobile-ID
- Mobile Identification Number
- Mobile Satellite Service
- Mobile Station Identifier
- Mobile Telephone Switching Office
- Mode
- Modulation
- Modulation, Analog
- Modulation, Digital
- Module, Appliance
- Module, Lamp
- Moiré
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- Morse Code
- MOSFET
- MOSFET, Enhancement-mode
- MOV
- MP
- MP3
- MP3 Player
- MP3Pro™
- MP3 Utility
- MPEG
- MPEG-1 Layer 3
- MSA
- MSAudio
- MSID
- MSS
- MTA
- MTSO
- Multimeter
- Multimeter, Analog
- Multimeter, Digital
- Multimedia Card
- Multi-megapixel
- Multipoint Multichannel Distribution Service
- Multipurpose Internet Mail Extensions
- Multi Spot Focusing
- Multiple Exposure
- Multi-switch
- MW
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