passe-partout

• ⇰ That by which one can pass anywhere; a safe-conduct.
• ⇰ A master key; a latchkey.
• ⇰ A light picture frame or mat of cardboard, wood, or the like, usually put between the picture and the glass, and sometimes serving for several pictures.
• ⇰ A strip of adhesive paper or gummed tape used to mount a picture between a piece of glass and a backing.
• ⇰ The method of mounting a picture between a piece of glass and a backing, using a passe-partout{4}.