1) my great one, my honourable sir
2) Rabbi, a title used by the Jews to address their teachers (and also honour them when not addressing them)
Part of Speech: noun masculine
Citing in TDNT: 6:961, 982
Of Hebrew origin [H7227] with pronominal suffix; my master, that is, Rabbi, as an official title of honor: - Master, Rabbi.
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 ῥαββί; click on the second column to search for that grammatical form of the root ῥαββί; click on the third column to search for that word and grammatical form; click on the total to search for the root ῥαββί.