Of warfare, conflict, etc.: occurring within a society or community; taking place between inhabitants of the same country or state, or between the…

Internal with regard to a country or people; domestic, civil: usually said of war, feuds, or troubles, also of enemies.

Of a conflict: (originally) mutually destructive or antagonistic; (now chiefly) taking place within a group or society, internal. Cf. internecine…

= intestine, adj. 1. rare.