Source: The Collaborative International Dictionary of English v.0.48
Encroachment \En*croach"ment\, 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]
Source: Bouvier's Law Dictionary, Revised 6th Ed (1856)
ENCROACHMENT. An unlawful gaining upon the right or possession of another;
as, when a man sets his fence beyond his line; in this case the proper
remedy for the party injured is an action of ejectment, or an action of
trespass.