Etymologically

Etymology and origin of the Latin word existimo

Confidence
Established
Formation
Derivation
First attested
c. 250–184 BC, Plautus
Ultimate origin
Latin (aestimō)
Etymology tree
inherited borrowed derived
Latin aestimo
Latin existimo

Pronunciation

  • Classical: [ɛkˈsiːs.tɪ.moː][1]
  • Ecclesiastical: [eɡˈzis.ti.mo][1]

Forms

exīstimō (present infinitive exīstimāre, perfect active exīstimāvī, supine exīstimātum); first conjugation[1] It is also spelled existumō, and an inscription has exaestum-.[2][3]

Etymology

It is formed from Latin ex- + aestimō (“to value, estimate”), with the vowel weakened in the compound.[2][3][1][4] The origin of the simple verb is uncertain: de Vaan finds the derivation from aes “bronze” and a word for “cut” not credible, and prefers a connection with Proto-Indo-European *h₂eis- (“to seek”), the root of aeruscō “to beg”.[4]

Earliest recorded meaning

It is found from Plautus on:[4] neque quod dīxī floccī exīstimat, “he doesn't care a straw for what I said”.[2][3]

Semantic evolution

With a genitive of price exīstimāre means “to value, esteem” (nūllam rem tantī exīstimāre).[2] It then means “to judge, form an opinion of”, and with an accusative and infinitive “to think, suppose”.[2][1] In Church Latin it also means “to take account of”.[5]

Its nouns are exīstimātiō “opinion, reputation” and exīstimātor “judge, critic”.[1]

Timeline

  • c. 250–184 BC – First found in Plautus, with a genitive of value.[2][4][6]
  • 190–159 BC – Terence: quālem tū mē esse hominem exīstumēs, “what kind of man you think I am”.[2][6]
  • 81–43 BC – Cicero: nūllam rem tantī exīstimāssem, “I would have valued nothing so highly”.[2][6]

Meanings

Verb

  1. (with genitive of price) To value, esteem.[2][3][1]
  2. To judge, form an opinion of.[2][5]
  3. (with accusative and infinitive) To think, suppose.[2][1][5]
  4. To take account of.[5]

Word family

Usage notes

Döderlein distinguishes aestimāre, to estimate the exact value or price of something, from exīstimāre, to judge it by its worth or truth;[7] Cicero sets exīstimātiō, private opinion, against competent judgment (iūdicium).[7]

References

  1. ^ a b c d e f g h Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  4. ^ a b c d 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 Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
  6. ^ a b c Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  7. ^ a b Döderlein, Ludwig (1874), Döderlein’s Hand-book of Latin Synonymes, tr. H. H. Arnold, Andover: W. F. Draper

Derived terms

Cite this entry

“Existimo.” Etymologically, 18 Oct. 2026, etymologically.com/la/existimo. Accessed 19 Oct. 2026.

Last edited on . ·