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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.