Etymologically

Etymology and origin of the Latin word coaequo

Confidence
Established
Formation
Derivation
First attested
234–149 BC, Cato
Ultimate origin
Latin (aequus)
Etymology tree
inherited borrowed derived
Latin aequus
Latin aeque
Latin adaeque
Latin peraeque
Latin aequiter
Latin iniquus
Latin inique
Latin aequalis
English equal
French égal
French également
Latin inaequalis
Latin aequaliter
Latin aequo
Latin coaequo
Latin adaequo
Latin exaequo

Pronunciation

  • Classical: [koˈae̯.kʷoː][1]
  • Ecclesiastical: [koˈɛː.kʷo][1]

Forms

coaequō (present infinitive coaequāre, perfect active coaequāvī, supine coaequātum); first conjugation[1]

Etymology

It is from Latin con- + aequō (“to make level, make equal”).[2][1][3] De Vaan derives aequō from the adjective aequus (“level, equal”), probably from a form ⟨*aikwos⟩, for which he finds no convincing etymology.[4]

Earliest recorded meaning

The TLL dates it from Cato,[5] who uses it in the De agricultura of levelling a threshing floor.[6][7][8]

Semantic evolution

In its literal sense it is used of levelling ground: Sallust has montēs coaequāre, to level mountains, Columella of levelling clods and furrows, and an inscription of levelling a small shrine.[2][6][9] Figuratively it means to put on the same level or treat as equal: Cicero uses it of treating everything alike, and the second letter to Caesar attributed to Sallust of making everyone's favour equal.[2][9] A public law uses it of adjusting measures by the official weights.[2] In Augustine it means to compare, and Stelten gives the Church Latin senses “make equal, fill up, rank with”.[9][10] Medieval writers used it of levelling a forest and of demolishing, of smoothing, and of dividing equally, and also in mathematics and music.[11]

Timeline

  • 234–149 BC – Cato uses it of levelling a threshing floor.[6][8]
  • 86–34 BC – Sallust uses it of levelling mountains.[2][9][8]
  • 81–43 BC – Cicero uses it of treating everything alike.[9][8]
  • 354–430 AD – Augustine uses it of comparing.[9][8]

Meanings

Verb

  1. To make level, to level.[2][6]
  2. To regard or treat as equal, to equate.[2][9]
  3. To adjust by weighing.[2]
  4. (Late Latin) To compare.[9]
  5. (Medieval Latin) To level to the ground, demolish; to divide equally; to make smooth.[11]

References

  1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ Bianchi, Rossella; Lelli, Olga (2014), VOLI: Vocabolario di latino, Florence: Le Monnier
  4. ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  5. ^ Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  6. ^ a b c d Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  7. ^ Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  8. ^ a b c d e Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  9. ^ a b c d e f g h Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
  10. ^ Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
  11. ^ a b Mittellateinisches Wörterbuch bis zum ausgehenden 13. Jahrhundert (1967–), Munich: C. H. Beck; Bayerische Akademie der Wissenschaften
Cite this entry

“Coaequo.” Etymologically, 20 Oct. 2026, etymologically.com/la/coaequo. Accessed 20 Oct. 2026.

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