| Noun | 1. | passe-partout - key that secures entrance everywherekey - metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated skeleton key - a passkey with much of the bit filed away so that it can open different locks |
| 2. | passe-partout - a mounting for a picture using gummed tape mounting - framework used for support or display |