an augmented chord is a major triad (1 3 5) with a raised fifth (i.e. 1 3 5#).
the term used to describe the process of increasing an interval, for example C to G is a fifth but C to G# is an augmented fifth
refering to either an interval that is one-half step larger than a perfect or a major interval. An augmented triad consists of a major third and an augmented fifth above the root.