Eternal

Eternal
1. without beginning or end; lasting forever; always existing (opposed to temporal ): eternal life.
2. perpetual; ceaseless; endless: eternal quarreling; eternal chatter.
3. enduring; immutable: eternal principles.
4. Metaphysics . existing outside all relations of time; not subject to change.
noun
5. something that is eternal.
6. the Eternal, God.

Source

dictionary.reference.com