Etymologically

Etymology and origin of the Latin word incesto

Confidence
Established
Formation
Derivation
First attested
c. 250–184 BC, Plautus
Ultimate origin
Latin incestus
Etymology tree
inherited borrowed derived
Latin castus
Latin incestus
Latin incesto
From the same root
Latin caste ← castus
Latin castimonia ← castus
Latin castitas ← castus

Pronunciation

  • Classical: [ɪŋˈkɛs.toː][1]
  • Ecclesiastical: [in̠ʲˈt͡ʃɛs.to][1]

Forms

incestō (present infinitive incestāre, perfect active incestāvī, supine incestātum); first conjugation[1]

Etymology

It is from Latin incestus (“impure, unholy”), with the verbal suffix -ō.[2][3][1] The adjective is formed from in- (“not”) and castus (“pure, chaste”).[2]

Earliest recorded meaning

Plautus is the first to use it, in the Poenulus, of a man who loves a girl desperately but has never violated her: “neque eam incestavit umquam”.[2][4][5]

Semantic evolution

Its two senses are to make ritually impure and to defile by unlawful sexual relations.[2] It is mostly poetic and post-Augustan:[4] in Virgil a dead body “totamque incestat funere classem”, pollutes the whole fleet with death,[2][4] and Statius uses it of defiling altars and of the Furies defiling the day;[4] Claudian has it too.[4]

Timeline

  • c. 250–184 BC – Plautus uses it of violating a girl.[2][5]
  • 70–19 BC – Virgil uses it of a corpse polluting a fleet.[2][5]
  • c. 45–96 AD – Statius uses it of defiling altars.[4][5]

Meanings

Verb

  1. To make ritually impure, pollute, defile.[2][4]
  2. To defile by unlawful sexual relations, incestuous or otherwise; to dishonour.[2][4][1]

References

  1. ^ a b c d e Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  4. ^ a b c d e f g h Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  5. ^ a b c d Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
Cite this entry

“Incesto.” Etymologically, 24 Oct. 2026, etymologically.com/la/incesto. Accessed 24 Oct. 2026.

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