- metric camera
- micro-atmosphere
- microchannel plate
- microform
- microlock
- microribon
- microstrip
- microwave amplification
- microwave limiter
- microwave modulator
- microwave reflector
- message code
- message compression
- Message Distribution
- message spacing
- meta-mathematical
- meta-physics
- meta-system
- meta-theory
- metadyne
- metal antenna
- metal gate
- metal mast
- metalization mask
- metallization mask
- meteoric ionization
- meteorological satellite
- MF band
- microadjustment
- microfarad
- micron barrier
- microphone output
- microslot
- microware heating
- microwave aerial
- microwave beam
- microwave generator
- microwave synthesizer
- microwave transistor
- microwave tube
- midband gain
- midship section
- Mills cross
- miniature magnetron
- minicell
- mixed decimal
- mixed telephony
- mixed terrain
- mixer amplifier
- mixer output
- mixer stage
- microwave network
- microwave radiometer
- midship frame
- Mie scattering
- minimum rejection
- minor alarm
- mirror effect
- misdirected call
- miss narrowly
- mission specialist
- mixed path
- mimicroprocessor chip
- minimum charge
- minimum signal
- minor loop
- mission allowance
- mixed string
- mixer tube
- mixing pad
- mobile
- mobile antenna
- metallic structure
- metric wave
- metropolitan network
- metropolitan switch
- MFC telephone
- micro-channel
- micrometeorite
- micron circuit
- microphonic noise
- micropropulsion unit
- microwave absorption
- microwave antenna
- microwave module
- microwave signal
- microwave system
- minicomputer
- minidisk
- MINITRACK station
- missed handover
- missing page
- mission satellite
- mixer diode
- mixer preamplifier
- mixing ratio
- mixing stage
- mixing transistor
- mobile platform
- mobile service