Etymologically

Etymology and origin of the Latin word relapsus

Confidence
Established
Formation
Derivation
First attested
1324 proceedings against Kyteler More words from the 14th century
Ultimate origin
Latin relābor
Etymology tree
inherited borrowed derived
Latin lābor
Italian lavoro
Spanish labor
French labeur
Latin relābor
Latin relāpsus
English relapse
From the same root
Latin collābor ← lābor
Latin dēlābor ← lābor
Latin dīlābor ← lābor
Latin ēlābor ← lābor
Latin illābor ← lābor
Latin labīna ← lābor
Latin labōriōsus ← lābor
Latin labōrō ← lābor
Latin lāpsō ← lābor
Latin lāpsus ← lābor
Latin perlabor ← lābor
Latin prolabor ← lābor
Latin sublabor ← lābor

Forms

relāpsus m (genitive relāpsūs); fourth declension[1][2]

Etymology

It is formed from Latin relābor (“to slip back”) + -tus3, with the participle stem ⟨relāps-⟩.[2][1]

Earliest recorded meaning

Latham's first record is from 1324,[1] in the proceedings against Kyteler, where it means a falling back into heresy.[2]

Semantic evolution

Osbern of Gloucester lists it in his Derivationes in the literal sense “a falling backwards”.[2] Its usual sense was relapse into error, above all heresy: in English church records a heretic abjured his errors under pain of a public relapse.[2] Medieval Latin also had an adjective relapsus, “relapsed”.[1] English took relapse as a noun in the mid-15th century, from the English verb or from Medieval Latin relapsus.[3]

Timeline

  • 1324 – It appears in the proceedings against Kyteler.[1][2]
  • 1401 – A church council record mentions a sentence for relapse.[2]
  • 1422 – A Canterbury register has a heretic abjure under pain of public relapse.[2]
  • mid-15th century – English has the noun relapse, perhaps from Medieval Latin relapsus.[3]

Meanings

Noun

  1. A falling backwards.[2]
  2. A falling back into error, especially heresy; relapse.[2][1]

Usage notes

The form is also the perfect participle of relābor, “slipped back”.[4][5]

References

  1. ^ a b c d e f Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  2. ^ a b c d e f g h i j Latham, R. E., D. R. Howlett, R. K. Ashdowne, et al. (1975–2013), Dictionary of Medieval Latin from British Sources, London: British Academy / Oxford University Press
  3. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  5. ^ Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
Cite this entry

“Relapsus.” Etymologically, 8 Nov. 2026, etymologically.com/la/relapsus. Accessed 8 Nov. 2026.

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