1) anything above the ground
2) a room in the upper part of a house
Part of Speech: noun neuter
From G507 and G1093; above the ground, that is, (properly) the second floor of a building; used for a dome or a balcony on the upper story: - upper room.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root ἀνάγαιον; click on the second column to search for that grammatical form of the root ἀνάγαιον; click on the third column to search for that word and grammatical form; click on the total to search for the root ἀνάγαιον.