“immortal” – English explanatory dictionary

adj 1. who never dies ○ Roman emperors were believed to be immortal. 2. very famous; which will always be remembered ○ that immortal line from ‘Casablanca’: ‘play it again, Sam’ ○ And now, another song from the immortal Frank Sinatra. ■ noun a famous person who will always be remembered ○ W.G. Grace, and other cricket immortals

a. [L. immortalis; pref. im- not + mortalis mortal: cf. F. immortel. See Mortal, and cf. Immortelle.]
1. Not mortal; exempt from liability to die; undying; imperishable; lasting forever; having unlimited, or eternal, existance. “Unto the King eternal, immortal, invisible.” 1 Tim. i. 17. “For my soul, what can it do to that,
Being a thing immortal as itself?” Shak.
2. Connected with, or pertaining to immortality. “I have immortal longings in me.” Shak.
3. Destined to live in all ages of this world; abiding; exempt from oblivion; imperishable; as immortal fame. “One of the few, immortal names,
That were not born to die.” Halleck.
4. Great; excessive; grievous. [Obs.] Hayward. Immortal flowers, immortelles; everlastings. Syn. — Eternal; everlasting; never-ending; ceaseless; perpetual; continual; enduring; endless; imperishable; incorruptible; deathless; undying.

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