noun; the process of becoming smaller; becoming more compact or more dense

See Also

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Assimilation
Figure 14.10 - Proportionate Tonal Relations dictate Contraction or Expansion
Figure 9.10 - Phases of a Wave as series of Expansions and Contractions
Figure 9.5 - Phases of a Wave as series of Expansions and Contractions
Integration
Syntropy
5.8.5 - The complete Contraction Expansion Cycle is as follows
9.27 - Expansion and Contraction