Etymologically

Etymology and origin of the Latin word mutuo

Confidence
Established
Formation
Derivation
First attested
81–43 BC, Cicero
Ultimate origin
Latin mūtuus
Etymology tree
inherited borrowed derived
Latin muto
Latin mutuus
Latin mutuo
From the same root
Latin commuto ← muto
Latin immuto ← muto
Latin mutabilis ← muto
Latin permuto ← muto
Latin mutuor ← mutuus

Pronunciation

  • Classical: [ˈmuː.tu.oː][1]
  • Ecclesiastical: [ˈmuː.tu.o][1]

Forms

mūtuō (not comparable)[1]

Etymology

It is from Latin mūtuus (“reciprocal, borrowed”) + -ō, an adverb from the ablative of the adjective.[2][1][3] De Vaan traces mūtuus to Proto-Italic *moito- (“(object of) exchange”), whose further origin is disputed.[4]

Earliest recorded meaning

Köbler and Georges find it first in Cicero,[5][3] who has it of the tides of the sea, coming in and going out by turns.[3]

Semantic evolution

It appears in the letters to Cicero from Lepidus and Plancus, of mutual zeal and goodwill and of returning another's affection.[2][6] Quintus Curtius uses it in the sense of jointly or alike,[2] and Suetonius and Apuleius have it of exchanged services and mutual accusations.[7] Döderlein distinguishes it from invicem: both mean reciprocally, but invicem refers rather to actions done in turn and mūtuō to mutual states.[8]

Ecclesiastical Latin uses it for mutually, to one another, in return.[9]

Timeline

  • 81–43 BC – Cicero uses it of the tides.[3][5]
  • 1st century AD – Quintus Curtius uses it in the sense of jointly.[2][5]
  • c. 75–c. 150 AD – Suetonius uses it of exchanged services.[7][5]

Meanings

Adverb

  1. Mutually, reciprocally.[2][10]
  2. In return.[2][9]
  3. Jointly, alike.[2]

Usage notes

The OLD and the dictionaries list beside it a verb mūtuō “to borrow”, an active form of mūtuor found in Caecilius and in Pliny the Elder, who has the moon shine with light borrowed from the sun.[2][3][7]

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. ^ a b c d e Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  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. ^ a b c d Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  6. ^ Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  7. ^ a b c Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
  8. ^ Döderlein, Ludwig (1874), Döderlein’s Hand-book of Latin Synonymes, tr. H. H. Arnold, Andover: W. F. Draper
  9. ^ a b Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
  10. ^ Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
Cite this entry

“Mutuo.” Etymologically, 21 Oct. 2026, etymologically.com/la/mutuo. Accessed 22 Oct. 2026.

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