Etymograph

English

infirmation

Infirmation comes from Latin infirmātiō ‘weakening, invalidating’, from īnfirmus ‘sick, weak, infirm’, and ultimately from Proto-Italic *en- ‘in, into, in-’.

  1. Proto-Italicc. 1500–700 BCE*en-1‘in, into, in-’reconstructed
  2. Latinc. 75 BCE–200 CEfirmus1‘strong, firm’
  3. Latinc. 75 BCE–200 CEīnfirmus2‘sick, weak, infirm’
  4. Latinc. 75 BCE–200 CEīnfirmō3
  5. Latinc. 75 BCE–200 CEinfirmātiō4‘weakening, invalidating’
  6. Englishtodayinfirmation4

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Latin infirmus
  2. 2 Wiktionary, Latin infirmo
  3. 3 Wiktionary, Latin infirmatio
  4. 4 Wiktionary, English infirmation

Lineage

  1. Proto-Italicc. 1500–700 BCE*en-Wiktionary, Latin infirmus‘in, into, in-’reconstructed
  2. Latinc. 75 BCE–200 CEfirmusWiktionary, Latin infirmus‘strong, firm’
  3. Latinc. 75 BCE–200 CEīnfirmusWiktionary, Latin infirmo‘sick, weak, infirm’
  4. Latinc. 75 BCE–200 CEīnfirmōWiktionary, Latin infirmatio
  5. Latinc. 75 BCE–200 CEinfirmātiōWiktionary, English infirmation‘weakening, invalidating’
  6. EnglishtodayinfirmationWiktionary, English infirmation

Linked words

through Proto-Italic *en- ‘in, into, in-’

impulse, incense, incubation, incubus, impel, incubate, censer, 7 more

through Latin firmus ‘strong, firm’

firm, 12 more

Today it means

noun disconfirmation

Sources

Sources: Wiktionary, “infirmation”; the older steps come from the Wiktionary entries for Latin infirmus, Latin infirmo, Latin infirmatio. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.

Etymograph / Proto-Italic *en- / infirmation

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