passable

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Capable of being passed, traversed, or crossed; navigable.
• adjective Acceptable for general circulation.
• adjective Satisfactory but not outstanding; adequate.
• adjective Capable of being enacted.

from The Century Dictionary.

• Capable of being passed, traveled, navigated, traversed, penetrated, or the like: as, the roads are not passable; the stream is passable in boats.
• That may be passed from hand to hand as a thing of value; current; receivable: as, bills passable in lieu of coin.
• Such as may be allowed to pass; allowable; admissible; tolerable; reaching or just rising above mediocrity.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Capable of being passed, traveled, navigated, traversed, penetrated, or the like
• adjective Capable of being freely circulated or disseminated; acceptable; generally receivable; current.
• adjective Such as may be accepted or allowed to pass without serious objection; adequate; acceptable; tolerable; admissable; moderate; mediocre.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective That may be passed or traversed.
• adjective Tolerable; satisfactory; adequate.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective able to be passed or traversed or crossed
• adjective about average; acceptable