නිදාන·ත්‍රය, n. the three origins or periods of the existence of Gautama as බෝධිසත්‍ව and බුදුන්, viz. from his resolve to attain Buddhahood to his birth in the Tusita Paradise; the next, from that priod to his attainment of Buddhahood, and third from that attainment till his death.