n. 1. The act of entering gradually or silently upon the rights or possessions of another; unlawful intrusion. [ 1913 Webster ]
An unconstitutional encroachment of military power on the civil establishment. Bancroft. [ 1913 Webster ]
2. That which is taken by encroaching on another. [ 1913 Webster ]
3. (Law) An unlawful diminution of the possessions of another. [ 1913 Webster ]