Progression (noun)

1. The process of developing or moving gradually towards a more advanced state.
2. A series of musical chords or harmonies that move from one to another in a gradual and continuous way.

Origin:

Late middle english from old french progression, from latin progressio(n-) "a moving forward", from progredi "go forward".

Examples:

1. The progression of his career was slow but steady.
2. The progression of the disease was rapid.
3. The progression of the song was amazing.
4. The progression of technology has been phenomenal in recent years.
5. The progression of his thoughts was visible in his writing.