The best replacement for internal is external validity.

The best alternatives to internal are rated as following:
★★★★★  external validity
★★★★★  external locus of control
★★★★  external conflict
★★★  external
★★★  external hard drive
★★★  external motivation
★★  external frame backpack
★★  external recruitment
★  external hemorrhoids
★  external customers
★  external wastegate
★  external fertilization
★  external frame backpacks
★  family medicine
★  external recruiting
★  external stakeholders
★  external attributions
★  external hard drives
★  external ip address
  external respiration
  external control
  external port forwarding
  external fixation
  external hiring
  external sound card
  protected
  external ssd
  external fragmentation
  external frame packs
  external balance
  external communication
  external ip
  external modem
  external backpacks
  external dvd burner
  external extractor
  external harddrive
  external motivators
  external frame
  external marketing
  external attribution
  external blower
  external dvd burners

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Google Trends

Scale is based on the average worldwide traffic of internal in all years. Click on graph for more.
internal
external validity
external locus of control