Definition of margin

• n. - A border; edge; brink; verge; as, the margin of a river or lake.
• n. - Specifically: The part of a page at the edge left uncovered in writing or printing.
• n. - The difference between the cost and the selling price of an article.
• n. - Something allowed, or reserved, for that which can not be foreseen or known with certainty.
• n. - 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.
• v. t. - To furnish with a margin.
• v. t. - To enter in the margin of a page.