immortal

Short definition from Wiktionary

Adjective

1. 1
   Not susceptible to death; living forever; never dying.
2. 2
   Never to be forgotten; that merits being always remembered.
3. 3
   Connected with or relating to immortality.
4. 4
   Exceedingly great; excessive; grievous.

Noun

1. 1
   One who is not susceptible to death.
2. 2
   A preeminent or exemplary person or thing; a paragon.
3. 3
   A preeminent or exemplary person or thing; a paragon: A game of chess of especially high quality and entertainment, regarded as one of the best in history.
4. 4
   A member of an elite regiment of the Persian army.
5. 5
   A member of the Académie française.
6. 6
   An administrator of a multi-user dungeon.