0 (of an opinion or position) able to be defended successfully or held for a particular period of time: --
His theory is no longer tenable in the light of the recent discoveries.
The fellowship is tenable for (= lasts for) three years.
1 reasonable, or possible to achieve or defend: --
2 a job that is tenable for a particular period of time, or from a particular date, can be held for that period of time or from that date: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.