£20/$100, etc worth of sth › the amount of something that you can buy for £20/$100, etc: I've put £2 worth of stamps on the letter.
a month's/year's, etc worth of sth › the amount of something that can be done or used in a month/year, etc: an hour's worth of free phone calls
› [U] how important or useful someone or something is: She's finally proved her worth.