Definition of past:
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"
a verb tense that expresses actions or states in the past
earlier than the present time; no longer current; "time past"; "his youth is past"; "this past Thursday"; "the past year"
of a person who has held and relinquished a position or office; "a retiring member of the board"
so as to pass a given point; "every hour a train goes past"