Cost

Cost may mean:

The amount of money needed to buy something
Something other than money that is used up. Example: "Going to jail cost 5 years of my life". This usage is a metaphor.
Cost function
Cost of living, the amount of money it costs just to live in a certain place. It includes food, housing, etc.
Opportunity cost, the value of the next best thing you give up whenever you make a decision.

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