Definition from macmillandictionary.com
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Archaeology helps us to understand the past.
He has made similar promises in the past.
The business has grown steadily in the recent past.
Anyway, it’s all in the past now (=something unpleasant is over and can be forgotten).
My past as a player has undoubtedly helped me in my career as a coach.
a legacy of our imperial past
We discovered that the author had a murky past.
Only his family and closest friends know about his past.