(adverb) : dĭū (old form dĭūs, Orell. Inscr. 8206), old acc. form of duration of time; root in dies; v. Corss. Ausspr. 1, 232 sqq..
* 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.
* 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.

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