This is the 13984th most frequent German word.
gebraucht
"Used" or "secondhand."
Here, 'gebrauchtes' functions as an adjective, describing an object (the book) as previously used.
Ich habe ein gebrauchtes Buch gekauft.
I bought a used book.
In this sentence, 'gebraucht' is a form of the verb 'gebrauchen', meaning 'to use', and is used in the passive voice to indicate the action performed on the bike.
Das Fahrrad, das ich benutzte, wird täglich gebraucht.
The bicycle I used is being used daily.
Here, 'gebraucht' is again from the verb 'gebrauchen', used in a passive construction to imply necessity or current use.