Lewis Short
jam-jam (or separat. jam jam), the strengthened jam
* Already, now: o jamjam, optume, praeceptis paruisti,Plaut. Most. 2, 1, 72: jamjam faciam ut jusseris,id. Curc. 5, 3, 29: jamjam intellego, Crasse, quid dicas,Cic. de Or. 3, 24; id. Brut. 14, 55; id. Phil. 2, 34, 87: jamjam nulla mora est,Verg. A. 2, 701: jamjam casurae arces,Ov. M. 12, 588; v. jam, I. A. 1. b. α.
Charlton T. Lewis, Charles Short, A Latin Dictionary