Dime/daɪm/ Definition 1 of 5Pro Tip 1/2Monetary value Understand 'dime' signifies a small amount of money, useful in discussions involving finance or cost. That toy isn't worth a dime. Pro Tip 2/2Cultural expressions Recognize phrases like 'a dime a dozen' imply something is common and not unique. Selfie filters are a dime a dozen these days.