1. (for a body of water: sea, river etc.): capable of being navigated; deep enough and wide enough to afford passage to vessels.
  2. (for a boat): seaworthy; in a navigable state; steerable.
  3. (for a balloon): steerable, dirigible
  4. Easy to navigate.
    This Web site isn't very navigable. I can't tell which image links to which page.

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