永遠は英語で
eternity

英語の定義

eternity
1. n. Existence without end, infinite time.
2. n. (philosophy) Existence outside of time.
3. n. A period of time which extends infinitely far into the future.
4. n. (metaphysical) The remainder of time that elapses after death.
5. n. (informal, hyperbole) A comparatively long time.
It's been an eternity since we last saw each other.