Coinage is the system of making metal coins for use as money, or the coins themselves. For thousands of years, governments have created coinage by stamping metal disks with official designs to show they're genuine currency. The United States Mint produces our coinage: pennies, nickels, dimes, and quarters.

The word also means inventing a new word or phrase. When Shakespeare used the word “eyeball” in a play, it was his own coinage. Scientists often create coinage when they discover something new and need a name for it. The person who invents a word is said to coin the term.

These meanings connect through the idea of making something official and lasting. Just as a government stamps metal to create legitimate money, when you coin a phrase that catches on, you're creating something that enters the shared vocabulary. If your clever nickname for the class hamster spreads through the whole school, that's your coinage becoming part of your community's language.