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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
impaction is a noun meaning "the condition of being pressed closely together and firmly fixed". It carries 4 recorded senses.
the condition of being pressed closely together and firmly fixed
a disorder in which feces are impacted in the lower colon
a disorder in which a tooth is so crowded in its socket that it cannot erupt normally
a sharp collision produced by striking or dashing against something
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for impaction come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.