kalpa
/ˈkɑːlpə/noun
- (in Hindu and Buddhist tradition) an immense period of time, reckoned as 4,320 million human years, and considered to be the length of a single cycle of the cosmos (or 'day of Brahma') from creation to dissolution（印度教和佛教传说中的）劫（一段无比漫长的时期, 约43.2亿年, 被认为是宇宙或梵天从创始到毁灭的一个周期）。
词源
Sanskrit.