The term 'customary use' refers to the accepted or expected way of using something. It is often used in legal contexts to refer to the accepted or expected use of a particular item or service. USAGE (5 letters) is another term for customary use, and it is used to describe the manner in which something is used. Customary use is an important concept in law, as it can be used to determine whether or not a particular action is permissible.