Definition of internecine adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌɪntəˈniːsaɪn//
; NAmE NAmE//ˌɪntərˈniːsaɪn//
[only before noun] (formal)
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happening between members of the same group, country or organization internecine struggles/warfare/feuds Word Originmid 17th cent. (in the sense ‘deadly, characterized by great slaughter’): from Latin internecinus, based on inter- ‘among’ + necare ‘to kill’.
See the Oxford Advanced American Dictionary entry: internecine