LATIN DICTIONARYLexicon Latīnum
adverb

diū

diū (comparative diūtius, superlative diūtissimē)
Classical[ˈdi.uː]Ecclesiastical[ˈdiː.u]
Mille Verba core vocabulary

Meaning

  1. long, a long while, a while, for long, for a long time
    Quam diu quisquam erit qui te defendere audeat, vives, et vives ita ut nunc vivis, multis meis et firmis praesidiis obsessus ne commovere te contra rem publicam possis. Multorum te etiam oculi et aures non sentientem, sicut adhuc fecerunt, speculabuntur atque custodient.As long as one person exists who can dare to defend you, you shall live; but you shall live as you do now, surrounded by my many and trusty guards, so that you shall not be able to stir one finger against the republic: many eyes and ears shall still observe and watch you, as they have hitherto done, though you shall not perceive them.63 BCE, Cicero, Catiline Orations:
  2. continually, all day
  3. long enough
  4. by day
    Noctuque et diu ut viro subdola sis,opsecro memento. 1912 translation by Henry Thomas Riley by night and [by] day to be tricking your husband, prithee, do remember.c. 180 BCE, Plautus, Casina 4.4.6
    […]commune alacres[…]continuum diu noctuque iter properabant.1876 translation by Alfred John Church, William Jackson Brodribb […] a common enthusiasm […] they hurried on by day and [by] night their uninterrupted march.c. 117 CE, Tacitus, Annales 15.12

Latīnē defined in Latin in our graded readers

longum tempus; quī diū labōrat, fessus fit.
diū adv. — in Mille Verba, Tempus et Numerī

Choosing the right word Döderlein's Latin Synonyms

Dies · Tempus · Tempestas · Die · Interdiu

1. Dies (from ἔνδιος) denotes time in its pure abstract nature, as mere extension and progression; whereas tempus and tempestas, with a qualifying and physical reference, as the weather and different states of time; tempus denotes rather a mere point of time, an instant, an epoch; tempestas, an entire space of time, a period. Hence dies docebit refers to a long space of time, after the lapse of which information will come, like χρόνος; whereas tempus docebit refers to a particular point of time which shall bring information, like καιρός. (iv. 267.) 2. Die means by the day, in opp. to by the hour or the year; whereas interdiu and diu, by day, in opp. to noctu; but interdiu stands in any connection; diu only in direct connection with noctu. (iv. 288.)

Pridem · Diu · Dudum · Diuturnus · Diutinus

1. Pridem (πρὶν δή) denotes a point of time, as long before; diu and dudum, a space of time as long since; diu denotes many days, months, years ago; dudum (δαρόν?) several minutes or hours since. Jam pridem mortuus est means, he died long ago, as an aorist; jam diu mortuus est, he has already long been in his grave as a perfect. Cic. Cat. i. 1. Ad mortem te duci jam pridem oportebat; in te conferri pestem illam quam tu in nos omnes jamdiu machinaris. Tac. Ann. xv. 64. Seneca Annæum diu sibi amicitiæ fide et arte medicinæ probatum orat, proviram pridem venenum promeret. 2. Diutunus denotes long duration indifferently, as something long in a general sense, or with praise, as something lasting and possessing durability, in opp. to that which quickly passes away, like χρόνιος; whereas diutinus, with blame, something protracted and wearisome, like αἰανός. Cic. Senect. 19. Nihil mihi diuturnum videtur, in quo est aliquid extremum: comp. with Fam. xi. 8: Libertatis desiderio et odio diutinæ servitutis.

Phrases from Meissner's Latin Phrase-Book

ne diutius vos demorer
not to be prolix.
diu anceps stetit pugna
the issue of the day was for a long time uncertain.

dĭū (old form dĭūs, Orell. Inscr. 8206), adv. old acc. form of duration of time; root in dies; v. Corss. Ausspr. 1, 232 sqq..
1. (Acc. to dies, I. B. 2.) By day (very rare), Manil. 4, 823; usually with noctu: noctuque et diu, Plaut. Cas. 4, 4, 5: noctu diuque, Titin. and Sall. H. Fragm. ap. Charis. p. 185 P. (Sall. H. 2, 54 Dietsch); Sall. J. 38, 3; 44, 5; 70, 1: nec noctu, nec diu, Plaut. Fragm. ap. Non. 98, 27: diu noctuque iter properabunt, Tac. A. 15, 12 fin.: noctu diuque hostibus obniti, id. H. 2, 5.—
2. (Acc. to dies, II. A. 3.; lit., a space of time, a while; hence, with intens. signif.) A long time, long while, long (freq. in all periods; cf.: pridem, dudum): nimis diu et longum loquor, Plaut. Ps. 2, 3, 21; cf. so with longum, id. Ep. 3, 2, 40: diu multumque scriptitare, Cic. de Or. 1, 33, 152; so, diu multumque, id. Or. 1; id. Phil. 13, 5; id. Sull. 26, 73; Sall. J. 94, 3; Flor. 2, 3, 5; also: multum diuque, Cic. de Sen. 3 fin.: multum et diu, id. Agr. 2, 32, 88; id. Inv. 2, 19, 58: multum ac diu, App. M. 2, p. 126, 6; cf. also: recordatus multum et diu cogitavi ... Eam rem volutavi et diu disputavi, Plaut. Most. 1, 2, 1 and 4: saepe et diu, Cic. Quint. 31, 96; cf.: saepe diuque, Hor. Ep. 1, 13, 1; diu diuque, App. M. 5, p. 167, 16; 12, p. 266, 16: diu atque acriter pugnatum est, Caes. B. G. 1, 26; 3, 21 et saep.: diu ego hunc cruciabo, Plaut. Capt. 3, 5, 73: Stoici diu mansuros aiunt animos: semper, negant, Cic. Tusc. 1. 31 fin.: diu princeps oratorum, aliquando aemulus Ciceronis, Quint. 11, 3, 8: tam diu restitisti, Plaut. Most. 3, 2, 100: tam diu, id. Mil. 3, 1, 34; id. ib. 4, 2, 89; Ter. Ad. 2, 2, 27; id. Hec. 4, 4, 23; id. Phorm. 1, 3, 13: eo, quo jam diu Sum judicatus, Plaut. Men. 1, 1, 20; so, jam diu, id. Capt. 4, 2, 102; id. Most. 1, 3, 144; id. Poen. 5, 4, 29; cf.: diu est jam, id. Most. 1, 4, 25: ille vult diu vivere, hic diu vixit: quamquam, O di boni! quid est in hominis vita diu? Cic. de Sen. 19, 68 and 69; cf.: sat diu vixisse, Plaut. Capt. 4, 2, 12: nimis diu maceror, id. Ep. 3, 1, 2; so, nimis diu, id. Merc. 1, 54; id. Pers. 4, 4, 105: non diu apud hunc servies, id. Pers. 4, 4, 65; cf.: haud diu, id. Mil. 2, 1, 17; Ter. Eun. 2, 3, 67.—Followed by dum, donec: diu expectare, dum, etc., Suet. de Rhet. 1: diu jacere donec, etc., Tac. G. 45.—Comp.: diūtius, longer [the t inserted, as in sectius and setius from secus, being a remnant of adv. ending -ter or -tus]: nolo te jactari diutius, Plaut. Trin. 3, 2, 59; id. Rud. 1, 2, 5; Ter. Heaut. 1, 1, 50; id. ib. 3, 1, 15; Cic. Lael. 27, 104; id. Rosc. Am. 7 fin.; Caes. B. G. 1, 16, 5; id. ib. 1, 26, 1 et saep.: cf.: minus diu quam, Cic. Att. 7, 3, 1.—In the historians freq. = a long while, very long, no comparison being intended: ne diutius commeatu prohiberetur, Caes. B. G. 1, 49; 3, 9, 5; 3, 29, 2; 4, 35, 2; 7, 20, 5 et saep.: neque illis, qui victoriam adepti forent, diutius ea uti licuisset, Sall. C. 39, 4: legiones diutius sine consulari fuere, Tac. H. 1, 9.—Sup.: (Cato) qui senex diutissime fuisset, Cic. Lael. 1, 4; so id. Pis. 37; id. de Imp. Pomp. 5 fin.; Caes. B. G. 6, 21, 4; Suet. Vit. 14 al.: ut quam diutissime te jucunda opinione oblectarem, Cic. Q. Fr. 1, 1, 1; so with quam, Caes. B. C. 3, 102, 3.—
B. Long since, a great while ago (mostly ante-class.): quod arci, diu facti, celeriter corruissent, Varr. ap. Non. 77, 14; cf.: scelus, inquam, factum'st jam diu antiquom et vetus, Plaut. Most. 2, 2, 45; so, jam diu, id. Ep. 1, 1, 9; id. Men. 2, 3, 28; id. Ps. 1, 3, 4; Ter. Eun. 5, 6, 1; Cic. Att. 1, 19, 9 al.; for which: diu jam, Plin. 25, 1, 1, § 2; id. 19, 4, 15, § 40: is ex Anactorio ... huc commigravit in Calydonem haud diu, not long ago, a short time ago, Ter. Ad. 4, 5, 15: nec loci gnara sum, nec diu hic fui, it is not long since I was here, Plaut. Rud. 1, 3, 28: jam diu est factum, quom discesti ab hero, id. As. 2, 1, 3.—With foll. quom, id. Merc. 3, 1, 44.— With postquam, id. Pers. 5, 2, 41.—With quod, id. Am. 1, 1, 146; August. Retract. 1 Prol.—
C. In Mela repeatedly of place, a long way: Italia ... inter superum mare et inferum excurrit diu solida, Mel. 2, 4, 1; so id. 1, 2, 3; id. 1, 3, 5. Cf. Hand Turs. II. pp. 285-291.

Origins

From Proto-Italic *djowe, from Proto-Indo-European *dyéw(i) (“during the day”), locative case of *dyḗws, with d possibly imported from diēs. Cognate with Old Armenian տիւ (tiw), Sanskrit दिवा॑ (dívā, “by day”), ज्योक् (jyok, “for a long while”).

Descendants
  • Romanshditg
  • Ladingiut
  • Ladindie

In English words that came into English from diū

  • diuturnaldiūturnus

Quick answers

What does diū mean in Latin?
diū, a adverb, means “long, a long while, a while, for long, for a long time; continually, all day; long enough”.
How do you pronounce diū?
In classical Latin, [ˈdi.uː]; in ecclesiastical (church) Latin, [ˈdiː.u].