Learn how to say Markup correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word markup:
1the amount added to the cost price of goods to cover overheads and profit:
a mark-up of 50 per cent
2 [mass noun] the process or result of correcting text in preparation for printing.
3 [mass noun] Computing a set of tags assigned to elements of a text to indicate their relation to the rest of the text or dictate how they should be displayed: