- selective modulator
- selective radiation
- selective sort
- selective system
- selectivity characteristic
- selectivity factor
- self-clocking
- self-contained
- self-correcting
- self-delimiting
- self-learning
- self-resetting
- semantic analysis
- semantic extension
- semantic network
- semantic relation
- semi ring
- semi-continuous
- semi-definite
- semi-diameter
- semi-invariant
- semi-lattice
- semi-normal
- semi-reducible
- semi-stability
- semiaxis
- semicolon
- semicompiled
- semiconductor device
- semiconductor disk
- semiotics
- send message
- send time
- sending
- sending office
- sense
- sense amplifier
- sense data
- sense light
- sense switch
- senseswitch
- sensing device
- sensitive
- sensitive film
- sensitive information
- sensitive regions
- sensitive relay
- Sensitivity analysis
- sensitivity control
- sensitivity drift
- sensitivity indication
- sensitivity meter
- sensitivity selector
- sensor glove
- sentence case
- sentence control
- sentential
- sentinel value
- sepalant
- separable equation
- separable extension
- separable process
- separable space
- separant
- separate compilation
- separated set
- separating plane
- separation filter
- separator
- separator bar
- separatrix
- sequence
- sequence check
- sequence control
- sequence counter
- sequence field
- sequence key
- sequence register
- sequence symbol
- sequenced display
- sequencing
- sequencing equipment
- sequential
- sequential access
- sequential algorithm
- sequential analysis
- sequential carry
- sequential computation
- series loading
- series winding
- serpentine
- serpentine curve
- serve
- server
- server application
- server management
- server room
- server workstation
- service
- service adapter