Kairos (καιρός) is an ancient Greek word meaning the right or opportune moment (the 'supreme moment'). The ancient Greeks had two words for time: Greek: χρόνος (chronos) and kairos. While the former refers to chronological or sequential time, the latter signifies a period or season, a moment of indeterminate time in which an event of significance happens. What is happening when referring to kairos depends on who is using the word. While chronos is quantitative, kairos has a qualitative, permanent nature. Kairos also means weather in modern Greek. The plural, καιροί (kairoi (ancient and modern Greek)) means the times.