1. Gone by in time and no longer existing.
2. The time before the moment of speaking or writing.
3. A past tense or form of a verb.
4. To or on the further side of.
5. Beyond in time; later than.
6. No longer capable of.
7. So as to pass from one side of something to the other.
8. Used to indicate the lapse of time.
Plural noun: Pasts.
Past is very hard to forget.