Of a location, building, etc.: capable of being defended against attack; = defendable, adj. 2.

Capable of being defended against physical attack, esp. armed attack; = defensible, adj. 3.

Capable of being held against attack; that may be successfully defended.

Capable of being held; = tenable, adj. 2. Obsolete.

Capable of being held; tenable.

Esp. of an opinion or an action at law: to be or able to be maintained, kept up, held, defended, etc.