Cost (noun)

1. The amount of money needed to buy, produce, or do something.
2. The total expenditure incurred in a particular activity or endeavor.
3. The price paid for goods or services.
4. A loss or sacrifice incurred in order to achieve a desired end.

Origin:

From old northern french cost, from latin costa.

Examples:

1. The cost of the project was estimated at $10 million.
2. The high cost of living was a concern for many families.
3. The cost of the dress was more than she could afford.
4. Despite the cost, the trip was worth it for the memories made.
5. The cost of a mistake can be very significant.