fastener

A fastener is something used to hold things together or keep them closed. In many cases, it is a small item such as a nail, screw, bolt, clip, button, or zipper. Different kinds are made for different jobs. A builder may use one to join pieces of wood or metal, while a tailor may use one to close a piece of clothing.

The related verb fasten means to close, attach, or secure something. You might fasten your seatbelt before driving or fasten a bag shut. The idea is simple: it keeps something in place so it does not come loose or open by accident.

A fastener is a thing used to join, attach, or secure something. In technical contexts, the word often refers to hardware such as nails, screws, bolts, nuts, rivets, staples, or clips. These are used in building, repair, manufacturing, and many other kinds of practical work. Their job is to hold parts together and help them stay firm.

In a broader everyday sense, the word can also refer to items that close or secure clothing, bags, or other objects. Buttons, zippers, snaps, hooks, and similar parts can all be called fasteners because they keep something shut or connected. The exact meaning depends on the context, but the central idea stays the same: a fastener keeps things joined or closed.

The verb fasten is closely related. When you fasten something, you attach it, close it, or make it secure. You can fasten a seatbelt, fasten a coat, fasten a rope to a post, or fasten a lid tightly. In each case, the action makes something safer, firmer, or less likely to move.

The word comes from Old English fæstnian, meaning "to make firm." That history fits the modern meaning well. Whether the word is used for a small screw in a machine or a zipper on a jacket, it describes something that makes a connection firm and reliable.