Monies means money — but it is not the everyday word. In ordinary talk we say money, and we do not count it like apples: nobody says “two moneys.” In law, government, and business papers, though, writers sometimes use monies (you will also see moneys) for sums of money, especially when the money comes from more than one place, is held for a special job, or must be given back. A judge might order that “all monies from the sale” go to the families. A town might warn people not to waste “public monies,” meaning money that belongs to everyone. It sounds stiff and a little old, like a contract, not like a chat in a shop. Though actually, even some lawyers now just say funds or money; students who drop monies into a friendly message will sound as if they are reading a court paper.