Levi = "joined"
1) the third son of the patriarch Jacob by his wife Leah, the founder of the tribe of Israelites which bears his name
2) the son of Melchi, one of Christ's ancestors
3) the son of Simeon, an ancestor of Christ
Part of Speech: noun proper masculine
Citing in TDNT: 4:234, 529
Of Hebrew origin [H3878]; Levi, the name of three Israelites: - Levi. Compare G3018.
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 Λευί; click on the second column to search for that grammatical form of the root Λευί; click on the third column to search for that word and grammatical form; click on the total to search for the root Λευί.