Definition from Wiktionary, the free dictionary
- (of a theory, argument, etc.) capable of being maintained or justified; well-founded
- Back in the 1800s, many did not consider Darwin's theory of evolution to be tenable at all.
- (of a defensive structure) capable of being defended against assault or attack; defensible
of a theory, argument etc: capable of being maintained or justified; well-founded
of a defensive structure: capable of being defended
tenable (plural tenables)