Question

what do yo mean by levelling?
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Answer 1

Answer:

to make something flat, equal or level...

Answer 2

Answer:

Levelling (British English) or leveling (American English); is a branch of surveying, the object of which is to establish or verify or measure the height of specified points relative to a datum. It is widely used in cartography to measure geodetic height, and in construction to measure height differences of construction artifacts.

Explanation:

hope it helps you if help please mark as breinliest