1
: located, seen, or used on the outside or surface of something
the external features of the building
the external signs of the disease
This medication is intended only for external use. [=for use on the skin]
2
: coming from outside
external pressures
external stimuli
3
: existing or occurring outside your mind
external reality
4
: concerning relationships with foreign countries
external [=foreign, international] affairs
Cite this Entry
“External.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/external. Accessed 19 Jun. 2026.
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