worth 1 
(wûrth)
(wûrth)n.
1. The quality that renders something desirable, useful, or valuable: the worth of higher education.
2. Material or market value: stocks having a worth of ten million dollars.
3. A quantity of something that may be purchased for a specified sum or by a specified means: ten dollars' worth of natural gas; wanted their money's worth.
4. Wealth; riches: her net worth.
5. Quality that commands esteem or respect; merit: a person of great worth.
adj.
Idioms: 1. Equal in value to something specified: worth its weight in gold.
2. Deserving of; meriting: a proposal not worth consideration.
3. Having wealth or riches amounting to: a person worth millions.
for all (one) is worth
To the utmost of one's powers or ability.
for what it's worth
Even though it may not be important or valuable: Here's my advice, for what it's worth.
[Middle English, from Old English weorth; see wer-2 in the Appendix of Indo-European roots.]