0 past simple and past participle of fasten
1 to (cause something to) become firmly fixed together, or in position, or closed:
To keep the helmet in position, fasten the strap beneath the chin.
The first skin panel will then be tacked in place and mechanically fastened.
However, their predicted production hours required for the mechanically fastened, monocoque concept were three times greater than what was predicted for the welded, monocoque concept.
There was a door, plus a panel at the side, which normally stayed fastened.