"pasts" in the noun sense
1. past, past times, yesteryear
the time that has elapsed
"forget the past"
a earlier period in someone's life (especially one that they have reason to keep secret
"reporters dug into the candidate's past"
3. past, past tense
a verb tense that expresses actions or states in the past
Source: WordNet® (An amazing lexical database of English)
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