Augmented chord

In general, an augmented chord is any chord which contains an augmented interval. An augmented sixth chord, for instance, has an augmented sixth between the highest and lowest notes. More specifically, the augmented chord is the triad consisting of a major third and augmented fifth above the root — if the root is C, the augmented chord consists of the notes C, E and G#. It can also be thought of as two major thirds stacked on top of one another, and thus resembles a major chord with a raised... full article at wikipedia