WordNet (r) 3.0 (2006):

Micah
    n 1: a minor Hebrew prophet (8th century BC) [syn: Micah,
         Micheas]
    2: an Old Testament book telling the prophecies of Micah
       foretelling the destruction of Jerusalem [syn: Micah,
       Micheas, Book of Micah]

Easton's 1897 Bible Dictionary:

Micah
   a shortened form of Micaiah, who is like Jehovah? (1.) A man of
   Mount Ephraim, whose history so far is introduced in Judg. 17,
   apparently for the purpose of leading to an account of the
   settlement of the tribe of Dan in Northern Palestine, and for
   the purpose also of illustrating the lawlessness of the times in
   which he lived (Judg. 18; 19:1-29; 21:25).

     (2.) The son of Merib-baal (Mephibosheth), 1 Chr. 8:34, 35.

     (3.) The first in rank of the priests of the family of
   Kohathites (1 Chr. 23:20).

     (4.) A descendant of Joel the Reubenite (1 Chr. 5:5).

     (5.) "The Morasthite," so called to distinguish him from
   Micaiah, the son of Imlah (1 Kings 22:8). He was a prophet of
   Judah, a contemporary of Isaiah (Micah 1:1), a native of
   Moresheth of Gath (1:14, 15). Very little is known of the
   circumstances of his life (comp. Jer. 26:18, 19).


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

Micah, poor; humble