- loop initialization
- loop network
- loop radiator
- loop stop
- loop system
- looped signal
- looping
- loopstick antenna
- local stability
- location update
- locked loop
- locked oscillator
- locked page
- locking device
- log scale
- log-in
- logarithmic characteristic
- logarithmic interpolation
- logarithmic scale
- logic microcircuit
- logic state
- logistic factor
- logistic support
- logistics module
- long number
- long word
- longitudinal balance
- longitudinal circuit
- longitudinal drift
- longitudinal filter
- longitudinal motion
- lost information
- loudspeaker telephone
- low coupling
- low gravity
- lower band
- LPC coder
- longevity increment
- longitudinal component
- loss probability
- lossless antenna
- lost call
- lot quality
- loudness control
- loudness level
- low emission
- low frequency
- low insulation
- loss plan
- loss-free
- low impedance
- lower magnetosphere
- lowest discharge
- luminance amplifier
- luminance component
- luminance signal
- lump sum
- lunar propagation
- lunar surface
- lunar tides
- lunation
- Mach cone
- machine check
- macro-instruction
- magcard
- magenta
- magic eye
- magnerton amplifier
- magnetic activity
- magnetic bay
- magnetic bearing
- magnetic card
- magnetic chuck
- magnetic component
- magnetic encoding
- magnetic ink
- magnetic recording
- magnetic screen
- magnetic stripe
- magnetic vector
- magnetometer probe
- magnetoscope
- magnetosphere
- magnetostriction filter
- mail path
- mail queue
- main board
- main carrier
- main channel
- main interferer
- main network
- main radiation
- main receiver
- maintenance processor
- major alarm
- major structure
- machine identification
- machine log
- machine translation
- macro definition