What the word does now
English speakers use past for more than one job, but the jobs hang together. As a noun it names time already finished, or a person’s earlier life. As an adjective it marks what is over, former, or immediately previous: a past president, the past year. As a preposition and adverb it places something beyond a point in space or time—just past the station, a car going past, half past three. Grammars use it for verb forms that report events already completed. The shared idea is simple: something has gone by.
An English spelling of passed
The origin of the word "Past" is not a ready-made noun taken from French. It is a specialized spelling of a participle. Middle English passen meant to go by something or to cross it. That verb’s past participle was written in many ways: passed, ypassed, passyd, paste, and the shorter past among them. The verb itself is a late-thirteenth-century borrowing from Old French passer. Historical dictionaries place the English form past in the period 1250–1300. By the early fourteenth century it is clearly an adjective, first with the sense that a trouble or a state is finished and no longer there. A mid-fourteenth-century use adds the more familiar time sense: belonging to an earlier period.
The preposition is attested around 1300 and grows out of that adjective. A speaker could already put the word before a noun or after a verb of motion and mean beyond. The noun—the past as a stretch of time—comes later, and the handbooks do not lock onto one year. Some descriptions put the noun in the fifteenth century, others around 1500, and older notes have suggested the later 1500s. The process is clearer than the date. A major historical dictionary treats the noun as conversion inside English: the adjective used as a thing.
From a Latin step
Passen was not inherited from Old English. It came through French from a reconstructed Vulgar Latin verb *passare, built for stepping, walking, and going by. That formation rests on Latin passus, a step or pace—the same noun behind English pace. Passus belongs with the verb pandere, to spread or stretch, and is usually traced to a Proto-Indo-European root reconstructed as *pete- or *peth₂-, with the sense of spreading out.
The family is therefore wider than a single English adjective. Romance cognates of the verb are close: French passer, Spanish pasar, Italian passare, and the matching time-words passé, pasado, and passato. English also keeps related loans that took other paths: passage, passport, and the mountain pass, from Old French pas for a step or track. A more distant relative is fathom, from Old English fæþm, an armful or arm-span—the same spreading gesture on the Germanic side.
A look-alike does not belong in this story. Another, rare English past can go back to Latin pastus, pasture. Everyday past—the one on clocks, in tenses, and in history books—is the participle of pass.
From finished to grammar and biography
The first English adjective is closer to finished than to historical. Something past was done. Within a few decades the meaning widened to time already gone. Spatial and temporal beyond grew beside that: you could walk past a house and live past a given hour. Clock English still uses that picture of time as a line you move along: minutes past the hour.
Grammar took the word later still. One standard chronology dates the grammatical sense—naming a form that reports earlier action or state—to the 1520s, the label past tense to the 1650s, and past participle to about 1775. Another English dictionary is more cautious and puts the grammatical adjective in the eighteenth century. Either way, the terms stuck because the participle of pass already named what had gone by, and school grammar needed a short native-looking word for the same idea.
The noun kept growing after it named time gone by. By the 1830s it could mean a person’s earlier life, career, or history—the sense still heard when someone is said to have a past. That use is narrower and more biographical than the vast, impersonal past of historians.
The verb, meanwhile, kept the full spelling. Passed remains the past tense and past participle of pass: time has passed; a bill was passed. Past took the other parts of speech. In most accents the two still sound the same, which is why writers confuse them. The split is leftover Middle English variation, not a later invention of style manuals.
A participle that left the verb
The concrete reminder is mechanical. Past is pass with its ending worn down and then specialized. Latin named the step passus; French made a verb of going by; English froze one spelling of that verb’s participle as a label for everything already gone—including, with some irony, the grammar of the verb that supplied the form. When English writes half past two rather than half passed two, it is using the participle that left the conjugation and became a word of its own.