Progression /(?)/

Pro·gres·sion

Progression

n.
  1. The act of moving forward; a proceeding in a course; motion onward.
  2. Course; passage; lapse or process of time.
    I hope, in a short progression, you will be wholly immerged in the delices and joys of religion.
  3. Regular or proportional advance in increase or decrease of numbers; continued proportion, arithmetical, geometrical, or harmonic. (Math.)
  4. A regular succession of tones or chords; the movement of the parts in harmony; the order of the modulations in a piece from key to key. (Mus.)