Lewis & Short

ex-ămussim, adv. [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 edepolexamussim est optuma, Plaut. Am. 2, 2, 213; App. M. 4, p. 150, 33; id. ib. 11, p. 271; cf. Hand, Turs. II. p. 664.