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
tenable (masculine and feminine, plural tenables)