
die Etage
floor
A floor or level in a building.
Das Büro befindet sich in der fünften Etage.
The office is located on the fifth floor.
floor
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floor
A floor or level in a building.
Das Büro befindet sich in der fünften Etage.
The office is located on the fifth floor.

level
In a figurative sense, a level in a hierarchy, especially the management level of a company ('Chefetage').
Diese Entscheidung wurde in der obersten Etage getroffen.
This decision was made at the highest level.
To indicate location, you use 'in der Etage' (on the floor; dative). If you are describing movement toward it, it is 'in die Etage' (to the floor; accusative).
Wir wohnen in der dritten Etage.
We live on the third floor.
You can usually recognize the figurative meaning of a hierarchy level from adjectives like 'oberste' (highest) or 'hohe' (high), or from the fixed combination 'Chefetage' (executive floor / top management).
Diese Entscheidung kommt direkt von der obersten Etage.
This decision comes directly from the highest level.
In a management context, the words 'Chefetage' (executive floor / top management) and 'Führungsetage' (management level) are very common for referring to the highest leadership level of a company.
Die Pläne wurden der Führungsetage bereits vorgestellt.
The plans have already been presented to the management level.
plain / level
Both words can refer to an accessible height or area in a building. Etage usually means a complete floor, while Ebene can also refer to an intermediate level, a parking level, or a platform level. Use Etage for a floor and Ebene for a broader height range.

Unsere Wohnung liegt in der dritten Etage.
Our apartment is on the third floor.
Der Aufzug hält auch auf der unterirdischen Parkebene.
The elevator also stops at the underground parking level.