Micah (mī'ku) [key], in the Bible. 1. Prophet, author of the book of Micah. 2. Levite. It is also spelled Michah. 3. Ephraimite whose sacred belongings were taken from him. 4. Son of Mephibosheth. It is also spelled Micha. 5. Same as Michaiah1.6. Same as Michaiah2.7. Reubenite.