margin

An amount beyond the minimum necessary is called the margin. If you sell craft items, you need to build in a profit margin so that you actually make money on the sale. You'll go broke if you sell mittens for $10 that cost you $15 to make.

The blank space around the edges of a sheet of paper — as with the page of a book — that surrounds the text is called the margin. It serves a few purposes: (1) The paper can be bound into a book without covering up the words; (2) If you are a teacher, student, or editor, you can make comments or notes in the margin. (3) If you're bored in class, you can doodle there.

Definitions of margin
1

n the boundary line or the area immediately inside the boundary

Synonyms:
border, perimeter
Types:
lip
either the outer margin or the inner margin of the aperture of a gastropod's shell
Type of:
bound, boundary, edge
a line determining the limits of an area

n the blank space that surrounds the text on a page

“he jotted a note in the margin
Type of:
blank space, place, space
a blank area

n a permissible difference; allowing some freedom to move within limits

Synonyms:
allowance, leeway, tolerance
Type of:
disagreement, discrepancy, divergence, variance
a difference between conflicting facts or claims or opinions

n an amount beyond the minimum necessary

“the margin of victory”
Types:
margin of error, margin of safety, safety margin
the margin required in order to insure safety
narrow margin, narrowness, slimness
a small margin
Type of:
amount
the relative magnitude of something with reference to a criterion

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

Synonyms:
gross profit, gross profit margin
Type of:
earnings, lucre, net, net income, net profit, profit, profits
the excess of revenues over outlays in a given period of time (including depreciation and other non-cash expenses)

n the amount of collateral a customer deposits with a broker when borrowing from the broker to buy securities

Synonyms:
security deposit
Type of:
deposit, down payment
a partial payment made at the time of purchase; the balance to be paid later

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