- source register
- space astronomy
- space coherence
- space conditioning
- space link
- space parity
- space segment
- space shuttle
- space stage
- space-SP
- spaceflight
- spacer
- spare line
- spatial response
- special facilities
- special relativity
- specialized services
- spectral absorption
- spectral bandwidth
- spectral characteristics
- spectral line
- spectral radiance
- spectral space
- spectral width
- spectrum amplitude
- spectrum analyzer
- spectrum component
- spectrum compression
- spectrum display
- spectrum division
- spectrum efficiency
- spectrum metrics
- spectrum occupancy
- spectrum sharing
- spectrum utilization
- speech analysis
- speech clipping
- speech compressor
- speech crosstalk
- speech encoding
- speech intelligibility
- speech memory
- speech pattern
- speech power
- speech signal
- speech sound
- speech voltmeter
- speech wire
- speed-dial
- spelling
- sound information
- sound modulation
- sound reproducer
- sound tape
- sound trap
- sounding unit
- source antenna
- source diskette
- source loss
- space allocation
- space cryogenics
- space diversity
- space environment
- space management
- space mission
- space monitoring
- space object
- space operation
- space research
- space shot
- space station
- space switch
- space technology
- space tracking
- space vacuum
- spaced antenna
- spaceship
- spacing block
- spare bit
- spare number
- spatial domain
- spatial modulation
- spatial period
- speaker
- speaking clock
- special actions
- special agreement
- special overtime
- specific mode
- specification check
- specification part
- spectral characteristic
- spectrum allocation
- spectrum congestion
- spectrum economy
- spectrum management
- spectrum recorder
- spectrum width
- speech channel
- speech clipper