Coin'age, n.
n. 1. The act or art of stamping or converting into money. “Gold pieces of different coinages.” W. Scott.
The care of the coinage was committed to the inferior magistrates. Arbuthnot.
Sense 2. Pieces of metal stamped and made legally current as money.
Sense 3. The cost or expense of coining money.
Sense 4. The act or process of forming or producing; formation; invention; fabrication. “Unnecessary coinage . . . of words.” Dryden.
This is the very coinage of your brain. Shak.