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insum

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Etymology and origin of the Latin word insum

Confidence
Established
Formation
Derivation
First attested
c. 235–200 BC, Naevius
Ultimate origin
Latin (sum)
Etymology tree
inherited borrowed derived
Latin sum
French soit
Latin adsum
Latin absum
Latin prosum
Latin possum
Latin possibilis
English possible
French possible
Latin impossibilis
English impossible
French impossible
Latin intersum
Latin insum
Latin supersum
Latin desum

Pronunciation

  • Classical: [ˈĩː.sũː][1]
  • Ecclesiastical: [ˈin.sum][1]

Forms

īnsum (present infinitive inesse, perfect active īnfuī, future active participle īnfutūrus); irregular conjugation, suppletive, no passive, no supine stem except in the future active participle, no gerund[1] The TLL notes that few first- and second-person forms are attested.[2]

Etymology

It is formed from Latin in- (“in”) + sum (“to be”).[3][1][2]

Earliest recorded meaning

Naevius has inerant signa expressa, “there were figures carved on it”, and Plautus ubi inest quidquid volēs, “in which is whatever you want”, of the horn of plenty.[3]

Semantic evolution

Inesse is “to be in or on” a place or object (Plautus: a gold ring inerit under the hat), to be written in a document, and of a feeling to show on the face.[3][4] It is to be contained in a number, to be among (Cicero: paucī tamen bonī inerant, “yet there were a few honest men among them”), and of qualities to be present in a person (Cicero: inerat … ingenium satis ācre, “he had a sharp enough mind”).[3][1] It is also “to be involved in, attached to” (Ennius: magna inest certātiō).[3][1]

Church Latin glosses it “to be in or on, belong to”.[5]

Timeline

  • c. 235–200 BC – Naevius: inerant signa expressa.[3][6]
  • c. 250–184 BC – Plautus of the horn of plenty.[3][6]
  • 81–43 BC – Cicero: inerat … ingenium satis ācre.[3][6]

Meanings

Verb

  1. To be in or on.[3][4][1][5]
  2. To be written in; to show (on the face).[3]
  3. To be contained in, be among, form part of.[3]
  4. To be present in, belong to (of qualities).[3][1][5]
  5. To be involved in, be attached to.[3][1]

References

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

“Insum.” Etymologically, 18 Oct. 2026, etymologically.com/la/insum. Accessed 18 Oct. 2026.

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