Definition of "impaction"

impaction

/ɪmˈpækʃən/

noun
countable and uncountable, plural impactions
1. Compression; the packing together of loose matter.
2. something packed together tightly; a mass of densely-packed matter
3. (medicine) A solid, immobile bulk of stool.
  Quotations
  As plastics cannot be easily egested, these can accumulate within the stomach, causing impaction and leading ultimately to death.
  2021, Alice A. Horton, Isobelle Blissett, Impacts of Plastic Pollution on Freshwater Aquatic, Terrestrial and Avian Migratory Species in the Asia and Pacific Region, Convention on Migratory Species, page 22
4. (dentistry) Failure of a tooth to erupt into the dental arch, because of adjacent teeth, dense overlying bone, excessive soft tissue, or other factor.