IPA: /ˈfæstənər/
KK: /ˈfæstənər/
A device used to hold or secure two or more objects together, such as screws, bolts, or clips.
The carpenter used a fastener to join the two pieces of wood.
Fastener → It is formed from "fast" (from Old English *fæst*, meaning firmly or securely) and "-ener" (a suffix used to indicate a person or thing that performs a specific action). The word "fastener" refers to a device that secures or holds things firmly together.
Think of something that holds things 'firmly' ('fast') together — that's what a fastener does.