1. the quality or state of being capable of being defended or justified
2. the quality of being capable of being protected against attack or harm
Usage: often used in military or strategic contexts

Examples

• The defensibility of the argument depends on the strength of the evidence presented.
• The fortress's defensibility was enhanced by its location on high ground.
• Legal experts questioned the defensibility of the company's position in court.
• The defensibility of the border was a major concern for military planners.
• She argued for the defensibility of her research methodology.
• The castle's defensibility made it an ideal stronghold during medieval times.