co-beˈlligerencyn. the quality or state of being co-belligerent or a co-belligerent.
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society > armed hostility > war > [noun] > position of belligerent(s)
belligerency1863
co-belligerency1943
1943 W. S. Churchill in Second World War (1952) V. xi. 168 The question of giving the Badoglio Government an Allied status does not come into our immediate programme. Co-belligerency is good enough.