top
n. countable A2 Elementary Oxford US //ˈtɑp// UK //tˈɒp// top
n. the highest point or surface of something. For example, the top of a mountain or the top of a table.
n. the highest or uppermost point, part, or surface of an object. It is the direct antonym of 'bottom'.
The top of the mountain is covered in snow.
She reached the top of the stairs, out of breath from the long climb.
From the top of the skyscraper, the city looked like a miniature model, with tiny cars crawling along its grid of streets.
Usage
Often used in the prepositional phrase 'on top of' to mean 'on the highest surface of' or 'in addition to'.
Pitfall
in the top of the mountainat the top of the mountainUse 'at the top' for points (like a peak or a list) and 'on top of' or 'on the top of' for surfaces (like a table or box).