Simple past tense and past participle of fasten.(verb)
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Use "fastened" in a sentence
"You will find the label fastened to the handle-bar."
"It would have been a shock had he not seen it before and been familiar with the label fastened to the breastbone reciting that this had once been Flat Nose George, an early day desperado of the high country."
"Young trees purchased from the nursery generally have a label fastened to them with a piece of wire."