Amata

Amata: Sanskrit amrta Not to die = Deathlessness, immortality, is a name for Nibbana the final liberation from the wheel of rebirths samsara, and therefore also from the ever-repeated deaths, since the unborn cannot die...

References

Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.