1) to want, lack
2) to desire, long for
3) to ask, beg
3a) the thing asked for
3b) to pray, make supplications
Part of Speech: verb
Citing in TDNT: 2:40, 144
Middle voice of G1210; to beg (as binding oneself), that is, petition: - beseech, pray (to), make request. Compare G4441.
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 δέομαι; click on the second column to search for that grammatical form of the root δέομαι; click on the third column to search for that word and grammatical form; click on the total to search for the root δέομαι.