What is the meaning of Penthouse?

A structure or annexe (especially one with a sloping roof) extending from the side of a building, sometimes as protection from the weather.

Something forming a shelter or canopy over something; an awning, shelter, etc.

Any of the sloping roofs at the side of a real tennis court.

An apartment or suite found on an upper floor, or floors, of a tall building, especially one that is expensive or luxurious with panoramic views.

To provide with a penthouse, shelter by means of a shed sloping from a wall, or anything similar.

penthouse

Source: wiktionary.org