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1. The quality of being hostile, ready to start a fight, or ready to go to war.
2. A hostile or warlike attitude, nature, or inclination; belligerency.
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Waging a war in cooperation against a common enemy without a formal treaty of military alliance.
Co-belligerence is a broader and less precise status of wartime partnership; such as, exists with a formal military alliance. Such an alliance may support each other materially, exchange intelligence, and have limited operational coordination.
The biggest farce of man's history has been the argument that wars are fought to save civilization.