What does "irrecoverable" mean?

Irrecoverable: Not capable of being recovered, regained, or remedied; irreparable; as, an irrecoverable loss, debt, or injury. That which is past is gone and irrecoverable. Bacon. -- Ir`re*cov"er*a*ble*ness, n. -- Ir`re*cov"er*a*bly, adv.