No. 15,056 in Russian
позапрошлого
"Позапрошлого" means "the one before last" or "previous to the last."
In a sentence
В позапрошлом году я ездил в Москву.
The year before last, I went to Moscow.
Here, 'позапрошлого' is used in the genitive case as 'позапрошлом', modifying 'году'. It indicates a past year occurring prior to the last one.
Дело позапрошлого века всё ещё обсуждают историки.
The matter of two centuries ago is still discussed by historians.
In this sentence, 'позапрошлого' is used as a modifier of 'века', denoting a century before the last one.
Я слышал эту песню на концерте ещё в позапрошлое лето.
I heard this song at the concert two summers ago.
Here, 'позапрошлое' is used in the accusative case as 'позапрошлое лето', referring to a summer that happened before the last summer.
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