Noun compaction has 2 senses
  1. compaction, compression, concretion, densification - an increase in the density of something
    --1 is a kind of concentration
    Derived form: verb compact1
  2. crush, crunch, compaction - the act of crushing
    --2 is a kind of compression, compressing
    --2 has particulars: grind, mill, pulverization, pulverisation
    Derived forms: verb compact3, verb compact2
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