/ ˈmɑːkʌp; NAmE ˈmɑːrk-/ noun
1.
[ usually sing. ] an increase in the price of sth based on the difference between the cost of producing it and the price it is sold at :
an average markup of 10%
2.
[ U ] ( computing ) the symbols used in computer documents which give information about the structure of the document and tell the computer how it is to appear on the computer screen, or how it is to appear when printed :
a markup language