This is the 12834th most frequent Russian word.
купленного
"Bought."
Here, 'купленного' serves as a past participle modifying 'велосипедом', indicating ownership or description of the bike.
Я воспользовался купленного велосипедом.
I used the purchased bicycle.
In this sentence, 'купленного' describes 'оборудования', identifying it as the one that was purchased.
Качество купленного оборудования оказалось высоким.
The quality of the purchased equipment turned out to be high.
Here, 'купленного' is a participle describing 'товара', specifying that the goods were previously bought.