/ dɪˈfensəbl; NAmE / adjective
1.
able to be supported by reasons or arguments that show that it is right or should be allowed :
Is abortion morally defensible?
OPP indefensible
2.
( of a place ) able to be defended from an attack
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WORD ORIGIN
Middle English (in the sense capable of giving protective defence ): from late Latin defensibilis , from Latin defendere , from de- off + -fendere to strike.