margin

noun

1. the boundary line or the area immediately inside the boundary
2. an amount beyond the minimum necessary"the margin of victory"
3. the amount of collateral a customer deposits with a broker when borrowing from the broker to buy securities
4. (finance) the net sales minus the cost of goods and services sold
5. the blank space that surrounds the text on a page"he jotted a note in the margin"
6. a permissible difference; allowing some freedom to move within limits