This is the 12276th most frequent Russian word.
использован
"Использован" means "used" (past participle).
The word 'использован' is used here as the past passive participle to describe a method that has been utilized in a completed action.
Этот метод был успешно использован в прошлом.
This method was successfully used in the past.
The word 'использован' functions as part of a sentence indicating that something (the tool) underwent action (used) in the past in a specific circumstance.
После ремонта, старый инструмент был снова использован.
After the repair, the old tool was used again.
Here, 'использован' indicates a passive ongoing state or habitual action, meaning the material commonly undergoes usage in construction processes.