amplĭtūdo (noun F) : amplus, in space
* Wide extent, breadth, width, amplitude, size, bulk (class., but only in prose).
* Lit.: membrorum,Varr. R. R. 2, 4, 3: simulacrum modicā amplitudine,Cic. Verr. 2, 4, 49: urbis,Liv. 7, 30: oppidum stadiorum LXX. amplitudine,Plin. 6, 26, 30, § 119: platanus adolescit in amplitudinem,id. 12, 1, 3, § 7: corporis,Plin. Ep. 6, 16, 3: Apollo amplitudinis et artis eximiae,Suet. Tib. 74: margaritarum,id. Caes. 47: valli,Tac. H. 4, 22: numeri,Gell. 19, 8, 12 al.—In plur.: amplitudines bonorum,Cic. Fin. 4, 7, 18.
* Trop.
* With gen., greatness: animi,Cic. Tusc. 2, 26, 64: harum rerum splendor, amplitudo,id. Off. 1, 20, 67: rerum gestarum,Nep. Att. 18: fortunae, Plin. praef. 3: opum, id. 3, 4, 5, § 31.—In plur.: amplitudines virtutum,Gell. 4, 9.
* Absol., dignity, grandeur, distinction, consequence (more general than dignitas, auctoritas, etc.; cf. Manut. ad Cic. Fam. 1, 5; Hab. Syn. 363): amplitudo est potentiae aut majestatis aut aliquarum copiarum magna abundantia,Cic. Inv. 2, 55, 166: homines, in quibus summa auctoritas est et amplitudo,id. Rosc. Am. 1: majestas est amplitudo et dignitas civitatis,id. de Or. 2, 39: ad summam amplitudinem pervenire,id. Brut. 81, 281: amplitudinem suam retinere,id. Fam. 1, 4: amplitudinem alicujus augere,Liv. 39, 48 al.
* In rhet., copiousness and dignity of expression: in his finis est amplitudo,Cic. Inv. 2, 16 fin., which see in full: uberi dignitas atque amplitudo est,Gell. 6, 14, 3.—Specifically: amplitudo Platonis,Cic. Or. 1 fin., for the Gr. πλατύτης τῆς ἑρμηνείας (Diog. L. 3, 4), which is by Plin. Ep. 1, 10, more literally called Platonica latitudo.—So of metre: amplitudo dactyli ac paeonis,the fulness, richness,Quint. 9, 4, 136; cf. id. 5, 14, 30.

s. TLL