rela - rice
- relative aperture
- relative displacement
- relative error
- relative humidity
- relative measurement
- relative motion
- relative velocity
- relative viscosity
- relaxation
- relaxation circuit generator
- relaxation generator
- relaxation methods
- relaxation of stress
- relaxation oscillations
- relaxation phenomenon
- relaxation test
- relay
- relay protection
- relay pump
- release
- release lever
- reliability
- reliability design
- reliability test
- reliability theory
- relief angle
- relief grinding
- relief valve
- relieved tap
- relieving
- relieving attachment
- relieving cam
- relieving lathe
- relieving tool
- reluctance
- reluctance motor
- remanence
- remote control
- remote control command
- remote control manipulator
