Meanings
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1
adj
characterized by bloodshed and carnage for both sides
Internecine war.
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2
adj
(of conflict) within a group or organization
An internecine feud among proxy holders.
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3
adj
Mutually destructive; most often applied to warfare.
Internecine strife in Gaza claimed its most senior victim yesterday when militants assassinated one of the most hated security chiefs there.
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4
adj
Characterized by struggle within a group, usually applied to an ethnic or familial relationship.
The Mongol people were plagued by internecine conflict until Genghis Khan unified them by focusing their aggression outwards on other peoples.
Etymology
Borrowed from Latin internecīnus (“deadly”), from internecium (“a massacre, bloodbath; an eradication”) + -īnus. In Latin, the sememe 'between' was here not expressed by the prefix, it instead either had a somewhat emphatic meaning or meant "down, under", comparable to its use in other Latin terms related to death: see interficiō and intereō. The English current sense is thus a reanalysis of the Latin through English inter-.