Definition of "eternity" in English

noun

1. (uncountable) Existence without end, infinite time.

2. (uncountable, philosophy, theology) Existence outside of time.

3. (countable) A period of time which extends infinitely far into the future.

4. (metaphysical) The remainder of time that elapses after death.

5. (informal, hyperbolic) A comparatively long time.

   • It's been an eternity since we last saw each other.