(1):

(a.) Capable of being freely circulated or disseminated; acceptable; generally receivable; current.

(2):

(a.) Capable of being passed, traveled, navigated, traversed, penetrated, or the like; as, the roads are not passable; the stream is passablein boats.

(3):

(a.) Such as may be allowed to pass without serious objection; tolerable; admissable; moderate; mediocre.