margin

(noun) the boundary line or the area immediately inside the boundary. Synonyms: border, perimeter.

(noun) an amount beyond the minimum necessary. Example: "The margin of victory."

(noun) the amount of collateral a customer deposits with a broker when borrowing from the broker to buy securities. Synonyms: security deposit.

(noun) (finance) the net sales minus the cost of goods and services sold. Synonyms: gross profit, gross profit margin.

(noun) the blank space that surrounds the text on a page. Example: "He jotted a note in the margin."

(noun) a permissible difference; allowing some freedom to move within limits. Synonyms: allowance, leeway, tolerance.