The past is a term used to indicate the totality of events which occurred before a given point in time.
The past is the object of such fields as history, archaeology, archaeoastronomy, chronology, geology, historical geology,
The highway to the East Coast which ran through the borough of Ebbfield had always been a main road and even now, despite the vast garages, the pylons and the gaily painted factory glasshouses which had sprung up beside it, there still remained an occasional trace of past cultures.
Sarkozy's total will be seen as a personal failure. It is the first time an outgoing president has failed to win a first-round vote in the past 50 years and makes it harder for Sarkozy to regain momentum.
He tried sneaking it past them, but they didn't cotton to his attempts.
Teaching has seen continual changes over the past decades.
Scarlet red is an aniline dye which has been used in the treatment of wounds and ulcers since the beginning of the past century.
Used in the Ending of Sentence
But McCartney, 50, is hardly ready to give up the ghost of his creative past.
[A]nyone saying now that humans are a towering inferno of irrationality ought to be challenged, and aggressively so. — Michael S. Gazzaniga, The Mind's Past.
The shop window reflected his image as he walked past.
Meaning of past for the defined word.
Grammatically, this word "past" is an adjective. It's also an adverb. It's also a noun, more specifically, a countable noun. It's also a preposition.