This is the 15306th most frequent German word.
untere
"Untere" means "lower" or "bottom" in English.
Here, 'untere' modifies 'Schublade' (drawer) to denote its position as the lowest one in the context of multiple drawers.
Die untere Schublade enthält wichtige Dokumente.
The bottom drawer contains important documents.
In this case, 'untere' describes 'Etage' (floor) to identify a floor located beneath upper floors within the building.
Die untere Etage des Gebäudes ist ein Geschäft.
The lower floor of the building is a store.
Here, 'unteren' qualifies 'Atmosphäre' (atmosphere) to specify a part of the atmosphere that is closer to the Earth's surface.