Definition of Earmark
A mark put upon a thing to distinguish it from another. Originally and literally, a mark upon the ear; a mode of marking sheep and other animals.
Property is said to be ear-marked when it can be identified or distinguished from other property of the same nature.
To set apart from others.
Money has no ear-mark, but it is an ordinary term for a privy mark made by any one on a coin.
That's the definition of Earmark in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.