Pronunciation: (märk'up"),[key] —n. 1. Com. a. the amount added by a seller to the cost of a commodity to cover expenses and profit in fixing the selling price.
b. the difference between the cost price and the selling price, computed as a percentage of either the selling price or the cost price.
c. an increase in price, as of a commodity.
d. the amount by which a price is increased.
2. the putting of a legislative bill into final form.
3. a detailed instruction, usually written on a manuscript to be typeset, concerning style of type, makeup of pages, and the like.