Margin

A border; edge; brink; verge; as, the margin of a river or lake.

Specifically: The part of a page at the edge left uncovered in writing or printing.

The difference between the cost and the selling price of an article.

Something allowed, or reserved, for that which can not be foreseen or known with certainty.

Collateral security deposited with a broker to secure him from loss on contracts entered into by him on behalf of his principial, as in the speculative buying and selling of stocks, wheat, etc.

To furnish with a margin.

To enter in the margin of a page.

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

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

a permissible difference; allowing some freedom to move within limits