Meaning of “worth” - Learner’s Dictionary

worth

noun uk us /wɜːθ/
£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.

(Definition of “worth noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)