Eternity

Different words for eternity across philosophical traditions include timelessness (atemporality), which is existence outside of time, and sempiternity (or everlastingness), which is existence for all of time. Other terms are aeon/aion (age, eon, forever), perpetuity (permanence, endlessness), and immortality (imperishability, unendingness). In Arabic philosophy, azal denotes eternity without a beginning, while abad denotes eternity without an end. Concepts of eternity

Timelessness (Atemporality): Exists outside of time, with no beginning or end, often associated with the divine.
Sempiternity (Everlastingness): Exists for all of time, with a beginning and an end, or no end but still existing within time.
Azal: A term from Arabic philosophy referring to eternity without a beginning.
Abad: A term from Arabic philosophy referring to eternity without an end.

Related philosophical terms

Aeon / Aion: Greek terms meaning “age” or “eon,” sometimes used to mean eternity or “forever”.
Perpetuity: A state of endlessness or being permanent.
Immortality: The state of living forever, or imperishability.
Infinity: A concept of endlessness, both in duration and extent.
Immutability: The quality of being unchangeable, often associated with the eternal nature of God.

AI responses may include mistakes.

[1] https://www.wisdomlib.org/christianity/concept/eternity

[2] wikipedia/en/Eternity