Real Dictionary

margin
countable noun: A margin is the difference between two amounts, especially the difference in the number of votes or points between the winner and the loser in an election or other contest.
countable noun: The margin of a written or printed page is the empty space at the side of the page.

margin in Accounting 1
noun: A margin is the difference between the selling price and the cost of an item.

margin in Accounting 2
noun: If you buy stocks on the margin, you borrow money in order to buy them, in the hope that they will increase in value before you have to pay the loan back.

margin in American English
a border, edge, or brink
noun: the space around the printed or written matter on a page
transitive verb: to provide with a margin or border

margin in British English
to provide with a margin; border
noun: an edge or rim, and the area immediately adjacent to it; border

margin in Finance
noun: If you buy stocks on the margin, you borrow money in order to buy them, in the hope that they will increase in value before you have to pay the loan back.

margin in Retail
noun: A margin is the difference between the selling price and the cost of an item.