progression Definition

1. An act or the process of moving forwards or advancing in stages.

Thesaurus: advancement, gain, progress, furtherance, advance, headway; Antonym: decline, deterioration.
2. Improvement.
3. music.
A succession of chords, the advance from one to the next being determined on a fixed pattern.
4. math.
A sequence of numbers, each of which bears a specific relationship to the preceding term. See arithmetic progression, geometric progression.