kalpa of disintegration ［空劫］ ( kū-kō): One of the four kalpas. The fourth and last period of the four-stage cycle of formation, continuance, decline, and disintegration, which a world is said to undergo repeatedly. The time it takes to complete this four-kalpa cycle is called a major kalpa. The kalpa of disintegration is the period lasting from the annihilation of a world at the end of the kalpa of decline until the formation of a new world. This kalpa, like the other three kalpas of the cycle, lasts for twenty small kalpas. Each small kalpa is said to last nearly sixteen million years. See also kalpa.