བསྐལ་བ བསྐལ་བ།
1) An aeon. 2) world age. 3) Kalpa. bskal pa, bskal ba, bskal ba, bskal ba intr. v [RY]
kalpa, aeon, world age [IW]
(tha mi dad pa - interrupted, obscured [by length of time/ distance, being hidden] [IW]