a.

1. 可通行的，可通过的[Z]
   Many of those roads are not passable in bad weather.

   那些路中有许多在天气不好时不能通行。

2. 过得去的，尚可的；合格的
3. （钱币等）可流通的，通用的[Z]
4. （建议的法律）可予通过的[Z]

adj.

1. good enough to be acceptable.
2. clear of obstacles and able to be travelled along or on.