LATIN DICTIONARYLexicon Latīnum
verbthird conjugation

cognōscō

cognōscō (present infinitive cognōscere, perfect active cognōvī, supine cognitum)
Classical[kɔŋˈnoːs.koː]Ecclesiastical[koɲˈɲɔs.ko]
cognōscēns pres. act. ptcp.№ 339 of the 1,000 commonest wordsMille Verba core vocabulary

Meaning

  1. to learn, to get to know
    ab (or ex) aliqua cognoscereto learn from someone
    Eodem die ab exploratoribus certior factus hostes sub monte consedisse milia passuum ab ipsius castris octo, qualis esset natura montis et qualis in circuitu ascensus qui cognoscerent misit.Having been informed by explorers that the enemy had sat down at the feet of a mount about eight thousand paces away from his camp, he [Julius Caesar] sent men to know what the mount was like and what was its ascent.c. 52 BCE, Julius Caesar, Commentarii de bello Gallico 1.21
  2. to be acquainted (with someone), recognize, apprehend
    [Giddenis] "Cognoscin Giddenenem ancillam tuam?". [Hanno] Novi."Do you know Giddenes, your servant maid?" "I know her".c. 194 BCE, Plautus, Poenulus 5.3.11–12
  3. to know, perceive, understand
    Cyrenenses tardius iere. Id socordiane an casu adciderit, parum cognovi.The Cyrenians went late. I know little about whether this event of laziness truly happened.86 BCE – c. 35 BCE, Gaius Sallustius Crispus, Jugurtha 79
    De consulum ficto timore cognoveram; Sicca enim φιλοστόργως ille quidem sed tumultuosius ad me etiam illam suspicionem pertulit.I knew about the consuls' imagined fear; our beloved man Sicca told me of course, even if rather disturbed, about that speculation too.106 BCE – 43 BCE, Cicero, Ad Atticum 15.17
  4. euphemisticto have had sex with, have ever slept with, (biblical) to know
    Turpiter illa virum cognovit adultera virgo;Shamelessly, she lay with a man as an adulterous virgin, (but) a chaste wedding torch gave me to you, and you to me.43 BCE – c. 17 CE, Ovidius, Heroides 6.133–4
    Adam vero cognovit Havam uxorem suam, quae concepit et peperit CainAdam knew his wife Eve, who conceived and gave birth to Cainc. 347 CE – 420 CE, Hieronymus, Vulgate Genesis.4.1

Latīnē defined in Latin in our graded readers

scīre incipiō; quod cognōvī, sciō.
cognōscō -ere cognōvī — in Mille Verba, Animus et Adfectūs
gets to know
cognōscit — in Seneca, ch. VIII

Choosing the right word Döderlein's Latin Synonyms

Intelligere · Sentire · Cognoscere

Intelligere denotes a rational discernment, by means of reflection and combination; sentire, a natural discernment, by means of the feelings, immediate images, or perceptions, whether of the senses or of the mind; lastly, cognoscere denotes an historical discernment, by means of the senses and of tradition. Sen. Ir. iii. 13. Quidni gauderet, quod iram suam multi intelligerent, nemo sentiret? Cic. N. D. iii. 24. Quare autem in his vis deorum insit, tum intelligam quum cognovero. (vi. 175.)

Conjugation conjugation 3

active indicative
formpresentimperfectfutureperfectpluperfectfut. perfect
1st sg.cognōscōcognōscēbamcognōscamcognōvīcognōveram
cognōram
cognōverō
cognōrō
2nd sg.cognōsciscognōscēbāscognōscēscognōvistī
cognōstī
cognōverās
cognōrās
cognōveris
cognōris
3rd sg.cognōscitcognōscēbatcognōscetcognōvit
cognōt
cognōverat
cognōrat
cognōverit
cognōrit
1st pl.cognōscimuscognōscēbāmuscognōscēmuscognōvimus
cognōmus
cognōverāmus
cognōrāmus
cognōverimus
cognōrimus
2nd pl.cognōscitiscognōscēbātiscognōscētiscognōvistis
cognōstis
cognōverātis
cognōrātis
cognōveritis
cognōritis
3rd pl.cognōscuntcognōscēbantcognōscentcognōvērunt
cognōrunt, cognōvēre
cognōverant
cognōrant
cognōverint
cognōrint
active subjunctive
active subjunctive
formpresentimperfectperfectpluperfect
1st sg.cognōscamcognōsceremcognōverim
cognōrim
cognōvissem
cognōssem
2nd sg.cognōscāscognōscerēscognōverīs
cognōrīs
cognōvissēs
cognōssēs
3rd sg.cognōscatcognōsceretcognōverit
cognōrit
cognōvisset
cognōsset
1st pl.cognōscāmuscognōscerēmuscognōverīmus
cognōrīmus
cognōvissēmus
cognōssēmus
2nd pl.cognōscātiscognōscerētiscognōverītis
cognōrītis
cognōvissētis
cognōssētis
3rd pl.cognōscantcognōscerentcognōverint
cognōrint
cognōvissent
cognōssent
passive indicative
passive indicative
formpresentimperfectfuture
1st sg.cognōscorcognōscēbarcognōscar
2nd sg.cognōsceris
cognōscere
cognōscēbāris
cognōscēbāre
cognōscēris
cognōscēre
3rd sg.cognōsciturcognōscēbāturcognōscētur
1st pl.cognōscimurcognōscēbāmurcognōscēmur
2nd pl.cognōsciminīcognōscēbāminīcognōscēminī
3rd pl.cognōscunturcognōscēbanturcognōscentur
passive subjunctive
passive subjunctive
formpresentimperfect
1st sg.cognōscarcognōscerer
2nd sg.cognōscāris
cognōscāre
cognōscerēris
cognōscerēre
3rd sg.cognōscāturcognōscerētur
1st pl.cognōscāmurcognōscerēmur
2nd pl.cognōscāminīcognōscerēminī
3rd pl.cognōscanturcognōscerentur
imperative
imperative
formactivepassive
pres. 2nd sg.cognōscecognōscere
pres. 2nd pl.cognōscitecognōsciminī
fut. 2nd sg.cognōscitōcognōscitor
fut. 3rd sg.cognōscitōcognōscitor
fut. 2nd pl.cognōscitōte—
fut. 3rd pl.cognōscuntōcognōscuntor
infinitives & participles
formactivepassive
present infinitivecognōscerecognōscī
perfect infinitivecognōvisse
cognōsse
cognitum esse
future infinitivecognitūrum essecognitum īrī
present participlecognōscēns—
perfect participle—cognitus
cognita, cognitā, cognitae, cognitam, cognitārum, cognitās, cognite, cognitī, cognitīs, cognitō, cognitōrum, cognitōs
future participlecognitūrus
cognitūra, cognitūrā, cognitūrae, cognitūram, cognitūrārum, cognitūrās, cognitūre, cognitūrī, cognitūrīs, cognitūrō, cognitūrōrum, cognitūrōs, cognitūrum
cognōscendus
cognōscundus
gerundcognōscendī, cognōscendō, cognōscendumsupinecognitum, cognitū

Phrases from Meissner's Latin Phrase-Book

usu cognitum habemus
we know from experience.
aliquid, causam cognoscere
to hold an inquiry into a matter.
Platonem legere et cognoscere
to study Plato.
multa cognita, percepta habere, multa didicisse
to be well-informed, erudite.
ratione, doctrina (opp. usu) aliquid cognitum habere
to have a theoretical knowledge of a thing.

co-gnosco, gnōvi, gnĭtum, 3 (
I. tempp. perff. contr. cognosti, Ter. And. 3, 4, 7: cognostis, id. Hec. prol. 8: cognoram, Cic. de Or. 1, 31, 143; Cat. 66, 26: cognoro, Cic. Att. 7, 20, 2; id. Fam. 2, 11, 2 fin.: cognorim, Cael. ap. Cic. Att. 10, 9, A, 1: cognoris, Ter. Phorm. 2, 1, 35; Lucr. 6, 534: cognorit, Ter. Eun. 5, 4, 11: cognosses, Cic. Fl. 21, 51; Cat. 91, 3: cognossent, Nep. Lys. 4 fin.: cognosse, Lucr. 1, 331; Cat. 90, 3; Ov. M. 15, 4 al.; v. Neue, Formenl. 2, 532; 2, 535), v. a. nosco.
I. To become thoroughly acquainted with (by the senses or mentally), to learn by inquiring, to examine, investigate, perceive, see, understand, learn; and, in tempp. perff. (cf. nosco) to know (very freq. in all periods and species of composition); constr. with acc., with acc. and inf., or a rel.-clause as object, and with ex, ab, the abl. alone, or per, with the source, etc., of the information, and with de.
A. By the senses: credit enim sensus ignem cognoscere vere, Lucr. 1, 697; 6, 194; Enn. Ann. ap. Pers. 6, 9 (v. 16 Vahl.); cf.: doctas cognoscere Athenas, Prop. 1, 6, 13; so, regiones, Caes. B. G. 3, 7: domos atque villas, Sall. C. 12, 3: Elysios campos, etc., Tib. 3, 5, 23: totum amnem, Verg. A. 9, 245: sepulcra, Suet. Calig. 3: Aegyptum proficisci cognoscendae antiquitatis, Tac. A. 2, 59; cf. Nep. Att. 18, 1: infantem, Suet. Calig. 13: si quid dignum cognitu, worth seeing, Suet. Aug. 43 rem, Lucil. ap. Non. p. 275, 22: ab iis Caesar haec dicta cognovit, qui sermoni interfuerunt, Caes. B. C 3, 18 fin.: si tantus amor casus cognoscere nostros.. Incipiam, Verg A. 2, 10: verum, quod institui dicere, miserias cognoscite sociorum, Cic. Verr. 2, 2, 27, § 65: aliquid et litteris et nuntiis cognoscere, id. Fam. 1, 5, 1; 14, 5, 1; 14, 6 init.: iter ex perfugis, Sall. C. 57, 3; id. J. 112, 1 al: per exploratores cognovit, Caes. B. G. 1, 22; 5, 49; 2, 11; 7, 16: deditio per nuntios cognita, Sall. H. Fragm. 2, 22 Gerl.: de Marcelli salute, Cic Fam. 4, 4, 3: de Bruto, id. Att. 5, 21, 10; Sall J. 73, 1: his (quibus) rebus cognitis very freq. in the historians, Caes. B G. 1, 19, 1, 33; 2, 17; 4, 30 et saep., so in abl. absol. cognito, vivere Ptolemaeum, Liv. 33, 41, 5, so id. 37, 13, 5; 44, 28, 4 al.; v. Zumpt, Gram. § 647.—
b. Like the Engl. to know, the Heb. (v. Gesen. Lex. s. h. v 3), and the Gr. γιγνώσκω (v. Lidd. and Scott, under the word, III.), euphem of sexual intercourse, Ov. H. 6, 133 aliquam adulterio, Just 5, 2, 5, 22, 1, 13: cognita, Cat 61, 147; Tac. H 4, 44.—
B. Mentally, to become acquainted with, learn, recognize, know: nihil certum sciri, nihil plane cognosci et percipi possit, Cic. de Or 1, 51, 222, Lucr 2, 840; quod Di vitiaci fratris summum in populum Romanum studium cognoverat, Caes. B. G 1, 19; cf. Sall. C. 51, 16 quem tu, cum ephebum Temni cognosses, Cic. Fl. 21, 51 et saep.: id se a Gallicis armis atque insignibus cognovisse, knew by their weapons and insignia (diff. from ex and ab aliquo, to learn from any one, v ab), Caes. B G. 1, 22; Ov. P 2, 10, 1; Phaedr. 4, 21, 22.—With acc. and inf: nunc animam quoque ut in membris cognoscere possis esse, Lucr 3, 117; cf. Auct. Her. 4, 18, 25: cum paucitatem mililum ex castrorum exiguitate cognosceret, Caes B G. 4, 30: aetatem eorum ex dentibus, Varr R. R. 2, 8 fin.: sed Metello jam antea experimentis cognitum erat, genus Numidarum infidum... esse, Sall. J 46, 3 al.—With acc. and part.: aliter ac sperarat rempublicam se habentem, Nep. Ham. 2, 1.—With rel.- clause: tandem cognosti qui siem, Ter And. 3, 4, 7: id socordiāne an casu acciderit, parum cognovi, Sall. J. 79, 5 al.—
II. To recognize that which is already known, acknowledge, identify (rare for agnosco): vereor, ne me quoque, cum domum ab Ilio cessim revertero, Praeter canem cognoscat nemo, Varr. ap. Non. p. 276, 9: eum haec cognovit Myrrhina, Ter. Hec. 5, 3, 32: primum ostendimus Cethego signum: cognovit, Cic. Cat. 3, 5, 10; cf.: sigilla, ova, id. Ac. 2, 26, 86; Lucr. 2, 349: pecus exceptum est, quod intra dies XXX. domini cognovissent, to identify, Liv. 24, 16, 5; cf.: ut suum quisque per triduum cognitum abduceret, id. 3, 10, 1; Ov. F. 2, 185: video et cognosco signum, Plaut. Ps. 4, 2, 45: faciem suam, Ov. A. A. 3, 508: cognito regis corpore, Just. 2, 6, 20: mores, Ov. P. 3, 2, 105.—So esp., to identify a person before a tribunal: cum eum Syracusis amplius centum cives Romani cognoscerent, Cic. Verr. 2, 1, 5, § 14; 2, 5, 28, § 72.—
III. With the access. idea of individual exertion (cf. Gr. γιγνώσκω), to seek or strive to know something, to inquire into, to investigate, examine (so freq. only as a jurid. and milit. t. t.): accipe, cognosce signum, Plaut. Ps. 4, 2, 31.
A. Jurid. t. t., to examine a case in law, to investigate judicially (cf. cognitio): Verres adesse jubebat, Verres cognoscebat, Verres judicabat, Cic. Verr. 2, 2, 10, § 26; cf. Quint. 4, 2, 21; Dig. 13, 4, 4 al.—So absol.: si judicas, cognosce, Sen. Med. 194.—With acc.: causam, Quint. 4, 1, 3; cf. id. 11, 1, 77 Spald. N. cr.: causas, Cic. Off. 2, 23, 82; Cic. Verr. 2, 2, 48, § 118. COGNITIONES, Inscr. Orell. 3042.—With de: de agro Campano, Cic. Phil. 5, 19, 53: de Caesaris actis, id. Att. 16, 16 B, 8: de hereditate, Cic. Verr. 2, 2, 7, § 19: hac de re, id. ib. 2, 1, 10, § 27; cf. Quint. 6, 3, 85; 7, 4, 35; 8, 3, 62 al.; Suet. Aug. 55; 93; id. Tib. 33; id. Calig. 38 al.: super aliquā re, Dig. 23, 2, 13: familiae herciscundae, i. e. ex actione familiae herciscundae, ib. 28, 5, 35; cf. ib. 27, 2, 2.—
2. Transf., of critics and the criticising public: cognoscere atque ignoscere, Quae veteres factitarunt, si faciunt novi, Ter. Eun. prol. 42; cf. id. Hec. prol. 3 and 8.—And of private persons in gen.: et cognoscendi et ignoscendi dabitur peccati locus, Ter. Heaut. 2, 1, 6.—
B. Milit. t. t., to reconnoitre, to act the part of a scout: qualis esset natura montis et qualis in circuitu ascensus, qui cognoscerent, misit, Caes. B. G. 1, 21 al— Also merely to inquire into, examine: numerum tuorum militum reliquiasque, Cic. Pis. 37, 91 (al. recognoscere).—Hence, *
1. cognoscens, entis, P. a., acquainted with: cognoscens sui, Auct. Her. 4, 18, 25. —Subst. in jurid. lang., one who investigates judicially Inscr Orell 3151; 3185.—* Adv.: cognoscenter, with knowledge, distinctly: ut cognoscenter te videam, Tert. adv. Marc. 4, 22.—
2. cognĭtus, a, um, P. a., known, acknowledged, approved. res penitus perspectae planeque cognitae, Cic. de Or. 1, 23, 108, cf. id. ib 1, 20, 92; id. Fam. 1, 7, 2. dierum ratio pervulgata et cognita, id. Mur 11, 25: homo virtute cognitā et spectatā fide, id. Caecin. 36, 104.—With dat.: mihi Galba, Otho, Vitellius nec beneficio nec injuriā cogniti, Tac. H. 1, 1, so Plin. 12, 21, 45, § 99.—Comp.: cognitiora, Ov Tr. 4, 6, 28. cognitius, id. M. 14, 15.—Sup.: cognitissima, Cat. 4, 14.

Origins

  1. Proto-Indo-European*ḱe?
  2. Proto-Indo-European*ḱóm
  3. Proto-Italic*kom
  4. Proto-Italic*kom-
  5. Latincognōscō

Proto-Indo-European *ǵneh₃- Proto-Indo-European *-sḱéti Proto-Indo-European *ǵn̥h₃sḱéti Proto-Italic *gnōskō Latin gnōscō Latin gnōscō Latin cognōscō From con- (prefix indicating completion) + gnōscō (“to know”).

Italo-Dalmatian
  • Italiancognoscere
  • Italianchignoscere
  • Italianconoscere
  • Italianconósciare
  • Istriotcugnussi
  • Venetancognosar
  • Sassaresecunniscifrom Corsican cunnosce
  • Dalmatianconniastro
  • Neapolitancanoscere
  • Neapolitancanósce
Gallo-Romance
  • Catalanconèixer
  • Frenchconnaîtrefrom Old French conoistre
  • Occitanconóisserfrom Old Occitan conoiser
  • Franco-Provençalcognetre
  • Bourguignonquenoîtrefrom Old French conoistre
  • Champenoisquenoîtrefrom Old French conoistre
  • Champenoisconnoîtrefrom Old French conoistre
  • Lorrainconoschefrom Old French conoistre
  • Normanconnaîtrefrom Old French conoistre
  • Normancounaîtefrom Old French conoistre
Ibero-Romance
  • Portugueseconhecerfrom Old Galician-Portuguese connocer
  • Spanishcoñocerfrom Old Spanish connoçer
  • Spanishconocer
  • Asturiancoñocer
  • Falacoñocelfrom Old Galician-Portuguese connocer
  • Galiciancoñecerfrom Old Galician-Portuguese connocer
  • Old Navarro-Aragoneseconyoscer
  • Aragoneseconoixer
  • Aragoneseconoxer
  • Aragoneseconeixer
Insular Romance
  • Sardinianconnoschere
  • Sardinianconnosciri
Borrowings
  • Englishcognosce
  • Scotscognosce
Balkano-Romance
  • Romaniancunoaște
  • Aromaniancunoscu
  • Megleno-Romaniancunos
Rhaeto-Romance
  • Friuliancognossi
  • Friuliancognoši
  • Romanshcugnuoscher
  • Romanshencanoscher
Gallo-Italic
  • Emiliancgnósser
  • Lombardcognossfrom Old Lombard cognosser
  • Lombardcognèssfrom Old Lombard cognosser
  • Piedmontesecognòsse
  • Romagnolcnóșar
  • Ligurianconósce
  • Piedmonteseconòsse

In English words that came into English from cognōscō

  • recognizerecognosco
  • quaintcognitus
  • cognitivecognitīvus
  • cognitioncognitiō
  • reconnoiterrecognoscere
  • incognitoincognitus
  • precognitionpraecognitio
  • cognizancecognōscō
  • cognoscentecognōscere
  • cognoscecognōscō
  • cognoscentcognōscēns
  • reconnoitrerecognoscere
  • cognoscitivecognōscō
  • recognitiverecognitus
  • cogniscientcognōscentem
  • cognoscencecognoscentia
  • quaintrellecognitus
  • precognoscepraecognoscere
  • recognoscerecognoscere
  • recognitorrecognitor

Quick answers

What does cognōscō mean in Latin?
cognōscō, a verb, means “to learn, to get to know; to be acquainted (with someone), recognize, apprehend; to know, perceive, understand”.
What are the principal parts of cognōscō?
cognōscō, cognōscere, cognōvī, cognitum (third conjugation).
How do you pronounce cognōscō?
In classical Latin, [kɔŋˈnoːs.koː]; in ecclesiastical (church) Latin, [koɲˈɲɔs.ko].
Where does cognōscō come from?
Proto-Indo-European *ḱe? → Proto-Indo-European *ḱóm → Proto-Italic *kom → Proto-Italic *kom- → Latin cognōscō.
Which English words come from cognōscō?
English words that go back to Latin cognōscō include cognizance, cognoscente, cognosce, cognoscent, cognoscitive and cogniscient.