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WordNet 3.0Copyright Princeton University
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n. - A sharp collision produced by striking or dashing against something; A disorder in which a tooth is so crowded in its socket that it cannot erupt normally;

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Usage examples (35)
  • But sometimes it can lead to serious problems, such as impaction or dysreflexia.
  • Yesterday, the CSU declared system-wide impaction, meaning many campuses could impose additional admission criteria on non-local students.
  • Constipation or impaction usually occurs in the dry season.
  • ( "Islands" of purely groundwater impaction within the canal command).
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The Open Dictionary of English is a collaborative project, based on Open Source materials, LearnThat resources, and partner APIs.
We give special thanks to our LearnThat volunteers, as well as Princeton University and Wiktionary for their Open Source word data. We're also grateful for the support given by Google, Wordnik.com, Dictionary.com, Stands4.com and YouTube, OEDILF.com, Kylescholz.com, Best-Practice.com, Forvo.com, as well as the generous Creative Commons community.