What is the meaning of margin?

noun

• The boundary line or the area immediately inside the boundary.
  • synonyms: border, perimeter
• An amount beyond the minimum necessary.
  • usage: "the margin of victory"
• The amount of collateral a customer deposits with a broker when borrowing from the broker to buy securities.
  • synonyms: security deposit
• Finance) the net sales minus the cost of goods and services sold.
  • synonyms: gross profit, gross profit margin
• The blank space that surrounds the text on a page.
  • usage: "he jotted a note in the margin"
• A permissible difference; allowing some freedom to move within limits.
  • synonyms: allowance, leeway, tolerance