Immortal a. : Not mortal; exempt from liability to die; undying; imperishable; lasting forever; having unlimited, or eternal, existance.

Immortal a. : Connected with, or pertaining to immortability.

Immortal a. : Destined to live in all ages of this world; abiding; exempt from oblivion; imperishable; as, immortal fame.

Immortal a. : Great; excessive; grievous.

Immortal n. : One who will never cease to be; one exempt from death, decay, or annihilation.

Example:
How can an Immortal being be considered a sacrifice?

Taxonomy
Immortal, metal, abbath, armagedda, horgh, apollyon, Blashyrkh, hypocrisy, aura noir, demonaz, norway, norwegian, ravendark, bergen.

Defination from the web:
Immortal - Official Site ... ENTER SITE ...