fastening
🇺🇸
/ˈfæsnɪŋ/
🇬🇧
/ˈfɑːsnɪŋ/
A device used to secure or join things together, like a button or a zip.
The jacket has a fastening at the front.
The way something is secured or joined, or the place where it is secured or joined.
The trousers have a fly fastening.