As a Noun:
1. Time without an end, or a state of existence that is outside time, especially the state which some people believe they will pass into after they have died. English = eternity.
As a Verb or Adjective:
1. To be something that continues for a very long time or without ever ending. English = (be) eternal, (be) everlasting.
As Modifier:
1. Used immediately after a verb to mean that the action continues for a very long time or without ever ending. English = for ever, for ever and ever, eternally.
2. Used immediately before a verb in questions to ask if the action has happened at any time, at least once. English = ever.