If it has to do with money or currency, it’s monetary, like your childhood toy collection that has no monetary value, but you love it nonetheless.
The adjective monetary is related to a Latin word that means “mint,” which is not just a refreshing gum or ice cream flavor but, in this case, where money is made. Anything that pertains to money can be described as monetary, like a country whose monetary system consists of metal coins of different denominations or an antiques expert who can tell you the monetary value of the old things in our attic.
