1) a portico, a covered colonnade where people can stand or walk protected from the weather and the heat of the sun
2) the portico built by Solomon in the eastern part of the temple
Part of Speech: noun feminine
Probably from G2476; a colonnade or interior piazza: - porch.
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 στοά; click on the second column to search for that grammatical form of the root στοά; click on the third column to search for that word and grammatical form; click on the total to search for the root στοά.