seri - shun
- series a.c. motor
- series circuit
- series coil
- series commutator motor
- series dynamo
- series excitation
- series feed
- series field
- series fouling
- series fouling circuit
- series generator
- series modulation
- series motor
- series notches
- series of stages
- series positions
- series release
- series resistance
- series running
- series single-phase commutator motor
- series telephone set
- series transformer
- series turns
- series-parallel combination
- series-parallel connection
- series-parallel control
- series-parallel switch
- serrated shed
- serve goods and passenger traffic
- service
- service abbreviation
- service application of brakes
- service band
- service brake
- service brake application
- service brake system
- service braking
- service braking distance
- service call
- service capacity
