the auspicious කල්පය or period of the world: there are said to be four kalpas, three of which have elapsed
this is the fourth and is called the auspicious kalpa because in it five Buddhas are to appear, four of whom have already appeared, and the fifth, called Maitri Buddha, is yet to come.
Carter, Charles. A Sinhalese-English dictionary. Colombo: The "Ceylon Observer" Printing Works; London: Probsthain & Co., 1924.