Fastening is a term used to refer to the act of securing something tightly. This term is commonly associated with belts, buckles, and garments. When it comes to synonyms for the word fasten, there are several alternatives to choose from, including affix, attach, fix, secure, and clasp. These words all have a similar meaning to fasten and can be used interchangeably in most cases. Affix is often used to refer to attaching something to another object, while attach can refer to joining two separate objects. Fix and secure both imply that something is being made stable and unable to move, while clasp often describes the act of fastening a buckle or other type of closure.