All 3 Uses of

immortal
in
Change of Heart, by Picoult

I don't want to achieve immortality through my work; I want to achieve immortality through not dying.†
*

immortality = eternal life (to live forever)

I don't want to achieve immortality through my work; I want to achieve immortality through not dying.†

One of the proofs of the immortality of the soul is that myriads have believed it.†

Definitions:

(1) (immortal)
living or existing forever

or:

someone famous throughout history

or:

someone who will never die -- such as a mythological god
(2) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

More rarely, "The Immortals" denotes a military corps of the Persian Empire. The Immortals were so-named because each time a member of the 10,000 man corps was killed or seriously wounded, he was replaced by another man. They are best remembered in western culture for their role in defeating the badly out-numbered Spartans at the Battle of Thermopylae.