know Copy link Outline I. To have a clear perception that a thing is so1. scio, 42. cognosco, ōvi, ĭtum, 3 (to come to the knowledge of facts, by observation or enquiry3. not to know, ignōro, 1II. To have an accurate knowledge of; esp. with ref. to languageIII. To be acquainted with, esp. a person1. nosco, 3 (esp. in perf. tenses; the imperf. tenses signi y, to get to k.)2. negative, ignōro, 1IV. To know how1. scio, 42. calleo, ui, 2 (to be expert • know: I. To have a clear perception that a thing is so: 1. scio, 4: foll. by acc. and inf., acc. of neut. pron., or rel. clause with subj.; also de and abl.: I k. that this is false, scio haec falsa esse: this I k., hoc scio: I k. how fond your friends are of you, scio quam sis amicis jucundus: he declared that he knew nothing about Sulla, de Sulla se scire negavit, Cic. Sull. 13, 39 (et pass.). Special phr.: as far as I k., quod sciam, Ter. Ad. 4, 5, 7: Cic.: more precisely, quantum ego quidem sciam, Quint. 3, 1, 19: let me k., fac ut sciam, Cic. Att. 4, 8, init.: I don't k. whether ... not, haud scio (nescio) an, with subj.: cf. Cic. Lig. 9, 26, constantiam dico? nescio an melius patientiam dicere possim, I don't k. whether I ought not rather to call it ...: cf. inclined (I., Phr.). So, negative of preced., nescio, 4 (not to know): same constr. as preced.: Cic. 2. cognosco, ōvi, ĭtum, 3 (to come to the knowledge of facts, by observation or enquiry: hence, in present sense, chiefly in perf. tenses): constr. usu. with acc. of object: also, acc. and inf., or rel. clause: that fact he k.s from their Gallic arms, id se a Gallicis armis cognovisse, Caes. B. G. 1, 22: Metellus knew by experience that ..., Metello experimentis cognitum erat, with acc. and inf., Sall. Jug. 46: v. to ascertain. 3. not to know, ignōro, 1: in this sense esp. with a negative, as haud (non) ignoro; or interrog. pron., as quis ignorat? Cic.: v. IGNORANT (TO BE). Phr.: it is well k.n, constat (v. agreed, to be): I k. quite well that you ..., notum exploratumque est mihi, te ..., Cic. fil. Fam. 16, 21, ad init.; compertum habeo (of that which one has tested by experience), Sall. Jug. 58, init.: do you k. what I mean? tenes quorsum haec tendant quae loquor? Pl. Ps. 1, 2, 81: so habeo is used, cf. Cic. Att. 5, 21, 7, extr., habes consilia nostra: nunc cognosce de Bruto, "you now k. (are in possession of) my plans; let me tell you about Brutus." II. To have an accurate knowledge of; esp. with ref. to language: nosco, vi, tum, 3 (esp. in perf. tenses: the imperf. signifying to get to know): to k. the laws, leges, jura nosse, Cic. in Pis. 13, 30. Negatively, ignoro: v. ignorant, to be. Phr.: to k. Latin, or not to k. it, Latine scire, nescire, Cic. Br. 37, 140: to k. geometry well, *geometricas rationes bene perspectas habere: See also infr. (IV.) III. To be acquainted with, esp. a person: 1. nosco, 3 (esp. in perf. tenses; the imperf. tenses signi y, to get to k.): cf. Pl. As. 2, 4, 58, Sauream non novi.--At nosce sane, "if you do not as yet k. him, I should like you to do so:" to k. a man by sight, nosse aliquem de facie, Cic. in Pis. 32, 81: cf. Ter. Hec. 3, 4, 25, non novi hominis faciem. 2. negative, ignōro, 1: you do not k. me Clinias, me ignoras, Clinia! Ter. Heaut. 1, 1, 53: cf. Cic. Rab. Post. 12, 33, et illum et me vehementer ignoras ("you are greatly mistaken in both him and me"). Phr.: to get to k. any one more intimately, aliquem propius inspicere, Plin. Ep. 4, 15, 3: to k. any one intimately, aliquo familiariter uti (implying friendship): v. intimately. IV. To know how: 1. scio, 4: to k. how to handle and use a thing, rem tractare et uti scire, Cic. Rep. 1, 17: Hor. Negatively, nescio (= non possum): cf. Cic. de Or. 3, 18, init., (Stoici) omnino irasci nesciunt, don't k. how (= cannot) to be angry: Hor. 2. calleo, ui, 2 (to be expert: in this sense, poet.): who k.s how to bear poverty, qui c. pauperiem pati, Hor. Od. 4, 9, 49. See also able, to be.