3) with numerals: somewhere about, about
Part of Speech: adverb
Genitive case of πός pos, an interrogitive pronoun, (what) otherwise obsolete (perhaps the same as G4225 used with the rising slide of inquiry); as adverb of place; at (by implication to) what locality: - where, whither.
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 πού; click on the second column to search for that grammatical form of the root πού; click on the third column to search for that word and grammatical form; click on the total to search for the root πού.