internal

The adjective internal describes something on the inside. If you're tempted by a second piece of cake, you may have an internal battle with yourself over whether you should eat the cake or not.

Internal can also describe something that takes place within a country or a group. You pay your taxes to the Internal Revenue Service, and politicians argue about how to spend your tax dollars when they discuss the country's internal affairs. You may have to write internal reports for your boss––reports that aren't supposed to be seen outside the company.

Definitions of internal
1

adj located inward

“"an internal sense of rightousness"- A.R.Gurney,Jr.”
Synonyms:
inner, interior
inward
relating to or existing in the mind or thoughts

adj innermost or essential

“the internal contradictions of the theory”
Synonyms:
inner, intimate
intrinsic, intrinsical
belonging to a thing by its very nature

adj occurring within an institution or community

Synonyms:
intragroup
intramural
carried on within the bounds of an institution or community

adj inside the country

“the nation's internal politics”
Synonyms:
home, interior, national
domestic
of concern to or concerning the internal affairs of a nation

adj happening or arising or located within some limits or especially surface

internal organs”
internal mechanism of a toy”
internal party maneuvering”
Synonyms:
inner
inside or closer to the inside of the body
interior
inside and toward a center
internecine
(of conflict) within a group or organization
intrinsic
situated within or belonging solely to the organ or body part on which it acts
inside
relating to or being on the side closer to the center or within a defined space
Antonyms:
external
happening or arising or located outside or beyond some limits or especially surface
outer
being on or toward the outside of the body
outside
originating or belonging beyond some bounds:"the outside world"
outside
relating to or being on or near the outer side or limit
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