Emmanuel = "God with us"
1) the title applied to the Messiah, born of the virgin, Mat 1:23, Is. Mat 7:14, because Jesus was God united with man, and showed that God was dwelling with man
Part of Speech: noun proper masculine
Of Hebrew origin [H6005]; God with us; Emmanuel, a name of Christ: - Emmanuel.
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 Ἐμμανουήλ; click on the second column to search for that grammatical form of the root Ἐμμανουήλ; click on the third column to search for that word and grammatical form; click on the total to search for the root Ἐμμανουήλ.