The Collaborative International Dictionary of English v.0.48:

Immanuel \Im*man"u*el\, n. [Heb. 'imm[=a]n?[=e]l, fr. 'im with +
   [=a]n? us + [=e]l God.]
   God with us; -- an appellation of the Christ. --Is. vii. 14.
   Matt. i. 23.
   [1913 Webster]

Easton's 1897 Bible Dictionary:

Immanuel
   God with us. In the Old Testament it occurs only in Isa. 7:14
   and 8:8. Most Christian interpreters have regarded these words
   as directly and exclusively a prophecy of our Saviour, an
   interpretation borne out by the words of the evangelist Matthew
   (1:23).


Hitchcock's Bible Names Dictionary (late 1800's):

Immanuel, God with us