Standard Lemma guide

impaction

noun · 9 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • /ɪmˈpækʃən/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • rhymes with -ækʃən

1

noun

Meaning 1

A compression; the packing together of loose matter.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

Something packed together tightly; a mass of densely-packed matter.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

A solid, immobile bulk of stool.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: gastroenterology, medicine, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

The failure of a tooth to erupt into the dental arch, because of adjacent teeth, dense overlying bone, excessive soft tissue, or other factor.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: dentistry, medicine, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

The situation where an institute, usually a college or university, receives more applications from qualified applicants than the number of spaces available, meaning that meeting the minimum admission requirements does not guarantee acceptance.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: education

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

noun

Meaning 6

a sharp collision produced by striking or dashing against something

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: impingement

Antonyms: none provided

Broader terms: crash, smash

7

noun

Meaning 7

a disorder in which a tooth is so crowded in its socket that it cannot erupt normally

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: impacted tooth

Antonyms: none provided

Broader terms: disorder, upset

8

noun

Meaning 8

a disorder in which feces are impacted in the lower colon

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: disorder, upset

9

noun

Meaning 9

the condition of being pressed closely together and firmly fixed

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: condition, status

History

Etymology

From Latin impingere (“to dash against, impinge”).

Across languages

Translations

4 source translations are retained for this English entry.

  • French: enclavement — failure of a tooth to erupt
  • French: inclusion — failure of a tooth to erupt
  • Portuguese: impactação — failure of a tooth to erupt
  • Portuguese: retenção — failure of a tooth to erupt