Definition: Pentimento, also known as a pentameter or pentatonic scale, is a musical scale that consists of seven notes. The first note in this scale is called the "root" and it has a loud pitch. The following six notes are all equal in volume but have different pitches: C, D, E, F, G, A. These notes form an open pentameter, which means that they can be played with one hand without needing to hold down any finger.