I.v. inch. n. and a. *
I. Neutr., to become very hardened, very callous: “civitatis patientia percalluerat,” Cic. Mil. 28, 76.—
II. Act., to get a good knowledge of; in perf., to be well acquainted with, to know well, be well versed in: “usum rerum,” Cic. de Or. 2, 34, 137; so, “disciplinas Stoicas et dialecticas,” Gell. 1, 22, 7: “leges,” id. 20, 1, 20: “quinque et viginti gentium linguas,” id. 17, 17, 2.