Etymologically

Etymology and origin of the Latin word cogo

Confidence
Established
Formation
Derivation
First attested
c. 250–184 BC, Plautus
Ultimate origin
Proto-Indo-European (*h₂eǵ-)
Etymology tree
inherited borrowed derived
Latin ago
French agir
Latin actrix
Latin actio
French action
Latin agito
French agiter
Latin perago
Latin adigo
Latin cogo
Latin activus
English active
English activist
Latin actus
English act
Latin actuosus
Latin actor
English actor
English actress
French acteur
Latin subigo
Latin redigo

Pronunciation

  • Classical: [ˈkoː.ɡoː][1]
  • Ecclesiastical: [ˈkɔː.ɡo][1]

Forms

cōgō (present infinitive cōgere, perfect active coēgī, supine coāctum); third conjugation[1] An inscription of the Arval Brethren has COGVIT for cōgit.[2]

Etymology

It is contracted from ⟨*co-agō⟩, formed from Latin con- + agō (“to drive”), “drive together”.[3][4][2][1] The simple verb continues Proto-Italic *ag-e/o- (“to do, act”), from Proto-Indo-European *h₂eǵ- (“to drive, lead”).[5] Compare Ancient Greek ἄγω (ágō, “to drive, lead”) and Sanskrit अजति (ájati, “drives”).[5]

Earliest recorded meaning

Plautus has ut sibi latrōnēs cōgerem et cōnscrīberem, “to collect and enlist mercenaries for him”.[3][6]

Semantic evolution

The first sense is “to drive together”: cattle (Tītyre, cōge pecus “Tityrus, round up the flock”), people, and troops, so “to assemble, muster”, “to raise” an army or fleet and “to convene” the senate or an assembly.[3] It is used of gathering crops and collecting money, and agmen cōgere is “to bring up the rear”.[3] From “bring into a mass” come “to compress, condense, abridge”, “to thicken, curdle, congeal” and “to full” cloth.[3]

Applied to persons it means “to drive” somewhere, “to reduce” to a condition (in ōrdinem cōgere “to bring to order”) and above all “to compel, force”, of people and of circumstances (necessitāte cōgī).[3][2] In argument it means “to prove conclusively”.[3]

Timeline

  • c. 250–184 BC – Plautus uses it of raising mercenaries and of compulsion (nisi necessitāte cōgar).[3][6]
  • 190–159 BC – Terence uses it of collecting money: quasi talenta ad quīndecim coēgī.[3][6]
  • 234–149 BC – Cato uses it of gathering olives.[3][6]
  • c. 50 BC – Caesar: coāctīs omnibus cōpiīs, “with all his forces assembled”.[3][6]
  • 70–19 BC – Virgil: Tītyre, cōge pecus.[3][6]

Meanings

Verb

  1. To drive together, round up (cattle, people).[3][2]
  2. To assemble, muster (troops);[3] to raise (an army, fleet).[3] agmen cōgere, to bring up the rear.[3]
  3. To summon, convene (the senate, an assembly).[3]
  4. To gather (crops);[3] to collect (money, taxes).[3]
  5. To bring together, concentrate.[3]
  6. To compress;[3] to condense, abridge.[3]
  7. To thicken, curdle, congeal;[3] to full (cloth), felt (wool).[3]
  8. To reduce (to a condition);[3] in ōrdinem cōgere, to bring to order.[3]
  9. To drive, force to go.[3]
  10. To compel, force, constrain.[3][2][7]
  11. To prove conclusively.[3]

Word family

  • coactim
  • coactiō
  • coāctō
  • coāctor
  • coactūra
  • coāctus
  • coagmentum
  • coāgulum
  • incoactus
  • recogo

Usage notes

Döderlein distinguishes cōgere, to compel by force and power, from adigere, to bring someone to something by reflection and motives.[8]

References

  1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  3. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z 27 28 29 Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  4. ^ Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  5. ^ a b de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  6. ^ a b c d e f Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  7. ^ Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
  8. ^ Döderlein, Ludwig (1874), Döderlein’s Hand-book of Latin Synonymes, tr. H. H. Arnold, Andover: W. F. Draper
Cite this entry

“Cogo.” Etymologically, 18 Oct. 2026, etymologically.com/la/cogo. Accessed 19 Oct. 2026.

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