- klystron amplifier
- Ku band
- L-section
- L-signal
- label block
- label length
- labeling schema
- labile oscillator
- lace
- ladder adder
- lag-window
- lagging voltage
- lagrangian function
- know-how
- L antenna
- label mode
- labeling scheme
- lacumary function
- ladder attenmuator
- laminar transistor
- land cable
- land path
- land station
- land-line
- lander stage
- landing site
- landscape
- landscape page
- language converter
- language extension
- lantern pinion
- lantern wheel
- lap joint
- lap link
- large signal
- laser action
- laser annealing
- laser aperture
- laser burst
- laser cavity
- laser detector
- laser emission
- laser emitter
- laser frequency
- laser guidance
- laser interferometer
- laser line
- laser melting
- laser oscillator
- laser radiation
- laser sensor
- laser tracker
- laser tracking
- laser trimming
- lasing
- last term
- latching
- latching transistor
- lateral transistor
- lattice
- lattice filter
- lattice mast
- lattice sampling
- launch base
- launch schedule
- launcher
- launching timetable
- leading note
- leading voltage
- leading zero
- learning curve
- leased line
- laser bandwidth
- laser beam
- laser code
- laser communications
- laser drill
- laser head
- laser illumination
- laser pulse
- laser scribing
- laser telemetry
- laser weapon
- lateral diffusion
- lateral structure
- lateral wave
- latitude excursion
- lattice plan
- launch abort
- launch point
- launch tower
- launcher rail
- launching capability
- launching ramp
- layout character
- lead module
- leakage field
- learning phase
- leased circuit
- lecher line