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Augmentation is a musical term used to mean different things in the context of melodies and intervalss or chordss.

A melody or sequence of notes is augmented if the lengths of the notes are prolonged (this is opposed to diminution, where the notes are shortened). A melody originally consisting of four quavers (eighth-notes) for example, is augmented if it later appears with four crotchets (quarter-notes) instead. This technique is often used in contrapuntal music. It gives rise to the "canon in augmentation", in which the notes in the following voice are longer than those in the leading. The music of Johann Sebastian Bach is an excellent aid to study this application.

An interval is augmented if it is widened; an augmented chord is one which contains an augmented interval. Thus an augmented fifth, for example, is a half step wider than the perfect fifth, and an augmented chord is a major chord whose fifth note has been raised a half step. The opposite is diminished, as in the diminished scale.

In heraldry, an augmentation is a modification or addition to a coat of arms, typically given by a monarch as either a mere mark of favour, or a reward or recongition for some meritorious act.