Lewis Short
(adverb) : ex-ămussim, amussis, by the rule, i. e.
* Exactly, precisely, perfectly (= ad amussim, Varr. R. R. 2, 1, 26; Gell. 1, 4, 1; 20, 1, 34); cf. Sisenn. ap. Charis. p. 178; Non. 9, 6 sq.; p. 80, 19 Müll. (ante- and post-class.): aedes Factae probe, examussim,Plaut. Most. 1, 2, 19: rem examussim disputare,id. Men. prol. 50; App. M. 2, p. 128, 13: nae ista edepol ... examussim est optuma,Plaut. Am. 2, 2, 213; App. M. 4, p. 150, 33; id. ib. 11, p. 271; cf. Hand, Turs. II. p. 664.
Charlton T. Lewis, Charles Short, A Latin Dictionary