Able to be defended or protected; capable of being justified or protected against attack.
From defence (noun) + -able (suffix meaning 'capable of'). 'Defence' comes from Latin 'defendere' (de- 'away' + fendere 'to strike'). The '-able' suffix dates to Old French.
In law and military strategy, calling something 'defenceable' means there's a legitimate argument for protecting it—like how a fortress might be militarily 'defenceable' even if it looks weak to outsiders.
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