- external potential
- external pressure confinement
- external procedure
- external product
- external propaganda
- external public
- external Q
- external Q factor
- external quality
- external quantum efficiency
- external radiation protection
- external radio frequency electromagentic environmental and susceptibility test
- external rate of return
- external ray
- external realms
- external recruitment
- external reflection
- external regeneration system
- external releasing agent
- external resonance
- external respiration
- external return
- external review
- external schema
- external-shaping theory of value