καιρός .καιρός, due measure, proportion, fitness, Hes., etc.; καιροῦ πέρα beyond measure, unduly, Aesch., etc.; μείζων τοῦ καιροῦ, Lat. justo major, Xen. of Place, a vital part of the body, like τὸ καίριον, Eur. of Time, the right point of time, the proper time or season of action, the exact or critical time, Lat. opportunitas, καιρὸς βραχὺ μέτρον ἔχει "time and tide wait for no man," Pind.; καιρὸν παριέναι to let the time go by, Thuc.; καιροῦ τυχεῖν Eur.; καιρὸν λαμβάνειν Thuc.; ἔχειν καιρόν to be in season, Thuc.:— καιρός ἐστι, c. inf., it is time to do, Hdt., etc. adverbial usages, εἰς or ἐς καιρόν in season, at the right time, opportune, Hdt., etc.; so, ἐπὶ καιροῦ Dem.;— κατὰ καιρόν Hdt.; πρὸς καιρόν Soph., etc.; and, without Preps., καιρῷ or καιρόν in season, Attic;—all these being opp. to ἀπὸ καιροῦ, Plat.; παρὰ καιρόν Eur.; πρὸ καιροῦ prematurely, Aesch. pl., ἐν τοῖς μεγίστοις κ. at the most critical times, Xen., etc. advantage, profit, fruit, τινος of or from a thing, Pind.; τί καιρὸς καταλείβειν; what avails it to . . ? Eur.; οὗ κ. εἴη where it was convenient or advantageous, Thuc.; μετὰ μεγίστων καιρῶν with the greatest odds, the most critical results, Thuc.