1. time without beginning or end; infinite time
2. the state of existing forever, especially after death
Usage: religious
3. a very long period of time
Usage: informal

Examples

• The concept of eternity is difficult for humans to comprehend.
• Many religions teach about life in eternity after death.
• The stars will shine for what seems like eternity.
• She believed their love would last for eternity.
• I’ve been waiting in this line for an eternity!
• The diamond ring symbolized their eternal commitment.
• Philosophers have long debated the nature of eternity.