margin

the boundary line or the area immediately inside the boundary

an amount beyond the minimum necessary; "the margin of victory"

the amount of collateral a customer deposits with a broker when borrowing from the broker to buy securities

(finance) the net sales minus the cost of goods and services sold

the blank space that surrounds the text on a page; "he jotted a note in the margin"

a permissible difference; allowing some freedom to move within limits