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
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
- To drive together, round up (cattle, people).[3][2]
- To assemble, muster (troops);[3] to raise (an army, fleet).[3] agmen cōgere, to bring up the rear.[3]
- To summon, convene (the senate, an assembly).[3]
- To gather (crops);[3] to collect (money, taxes).[3]
- To bring together, concentrate.[3]
- To compress;[3] to condense, abridge.[3]
- To thicken, curdle, congeal;[3] to full (cloth), felt (wool).[3]
- To reduce (to a condition);[3] in ōrdinem cōgere, to bring to order.[3]
- To drive, force to go.[3]
- To compel, force, constrain.[3][2][7]
- To prove conclusively.[3]
Word family
- coactim
- coactiō
- coāctō
- coāctor
- coactūra
- coāctus
- coagmentum
- coāgulum
- incoactus
- recogo
Related words
Usage notes
Döderlein distinguishes cōgere, to compel by force and power, from adigere, to bring someone to something by reflection and motives.[8]
References
- ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
- ^ a b c d e Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
- ^ 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
- ^ Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
- ^ 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
- ^ a b c d e f Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
- ^ Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
- ^ 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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