Music. the manner in which chords or melodic tones follow one another; a succession of chords or tones.
Astrology. any of a variety of methods of comparing the natal chart to subsequent planetary positions in order to establish an optimum time to accomplish things or to establish the probable time an event occurred or will occur.
(music) movement, esp of a logical kind, from one note to the next (melodic progression) or from one chord to the next (harmonic progression)
(astrology) one of several calculations, based on the movement of the planets, from which it is supposed that one can find the expected developments in a person's birth chart and the probable trends of circumstances for a year in his life
c.1440, "action of moving forward," from O.Fr. progression (1425), from L. progressionem (nom. progressio) "a going forward," from progressus, pp. of progredi "go forward," from pro- "forward" + gradi "to step, walk," from gradus "step" (see grade).