margin in WordNet English dictionary

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