Definition of: passe partout

(pas pär·t′, Fr. päs pár·t′)
1. A light picture frame consisting of a glass and a pasteboard back put together with strips of decorative tape pasted around the edge; also, the pasteboard mat of a picture.
2. Strips of gummed paper; tape.
3. A master key. [<F, orig. a key <passe, imperative of passer PASS + partout everywhere]