progression
pro.gres.sion \pr*-'gresh-*n\ \-'gresh-n*l, -*n-*l\ n 1: a sequence of numbers in which each term is related to its predecessor b y a uniform law 2a: an act of progressing : ADVANCE 2b: a continuous and connected series : SEQUENCE 2c: PROGRESS 3a: succession of musical tones or chords 3b: the movement of musical parts in harmony 3c: SEQUENCE - pro.gres.sion.al aj