One of the mysteries of the English language finally explained.
Mutual destruction, or mutual conflict or antagonism, especially within a society or community; civil war; internal conflict. Now rare.
Early 17th century (in an earlier sense). From classical Latin interneciōn-, interneciō extermination, massacre, slaughter, cause of extermination from inter- + nec-, nex death, destruction + -iō, after internecāre.
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