Webster's English Dictionary

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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