e-ter:ni-ty

{E} perpetuity
n.
perpetuity, endless time, infinite duration, infinity; sempiternity, everlastingness; eternity, timelessness; never-endingness; endurance, permanence, continuity; immortality, athanasia, deathlessness, incorruption, continuance; perpetuation, immortalization; memorial, lasting monument, reminder.
e-ter:ni-ty

{B} infinity n.
{C} time
n.
{D} neverness
n.
{F} immateriality
n.
{G} divine attribute
n.
{H} heaven
n.
e-ter:ni-ty

{A} existence n.
existence, being, entity; absolute being, the absolute, divineness; aseity, self-existence, quiddity; Platonic idea, universal; subsistence, life; survival, eternity, perpetuity; preexistence, priority; this life, present time; existence in space, prevalence, presence; entelechy, actualization, realization, becoming, evolution, conversion; creation,
e-ter:ni-ty / n. [U]

1 an eternity a very long time, or a period of time that seems very long because you are annoyed, anxious etc.
*We only waited five minutes, but it seemed like an eternity.

2 the whole of time, without any end
*The cause of the crash will continue to be a mystery for all eternity.

3 the state of existence after death that some people believe continues forever.

*LONGMAN Roget's Thesaurus
*LONGMAN AMERICAN DICTIONARY