the act of progressing; forward or onward movement.
a passing successively from one member of a series to the next; succession; sequence.
Mathematics. a succession of quantities in which there is a constant relation between each member and the one succeeding it. Compare arithmetic progression, geometric progression, harmonic progression.
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.

1400–50; late Middle English < Latin prōgressiōn- (stem of prōgressiō). See progress, -ion

progressional, adjective
progressionally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
progression (prəˈɡrɛʃən)
1.  the act of progressing; advancement
2.  the act or an instance of moving from one thing or unit in a sequence to the next
3.  maths arithmetic progression geometric progression See also harmonic progression a sequence of numbers in which each term differs from the succeeding term by a constant relation
4.  music movement, esp of a logical kind, from one note to the next (melodic progression) or from one chord to the next (harmonic progression)
5.  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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

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).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
progression   (prə-grěsh'ən)  Pronunciation Key 
See sequence.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The increasing accessibility of ideas is more of a progression than a rupture.
Haphazard career progression allows the well-connected to wriggle in.
They postulate that there was an extended period of evolutionary progression
  that left behind a scant fossil record.
There are those who oppose the progression toward leniency.
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