a.

1. （学说等）站得住脚的，经得起批判的
   His new theory is tenable.

   他的新理论是站得住脚的。

2. （阵地等）守得住的，可防守的
   a tenable position

   能防守的阵地

3. 可保持（某一段时间）的[F][（+for）]

adj.

1. able to be maintained or defended against attack or objection.
2. (of an office, position, etc.) able to be held or used:
   a scholarship tenable for three years.