Encroacher definitions

Webster's 1828 Dictionary

ENCROACHER, n. One who enters on and takes possession of what is not his own, by gradual steps.
1. One who makes gradual advances beyond his rights.

WordNet (r) 3.0 (2005)

n
1: someone who enters by force in order to conquer [syn: invader, encroacher]

Merriam Webster's

noun see encroach

Webster's 1913 Dictionary

Encroacher En*croach"er, n. One who by gradual steps enters on, and takes possession of, what is not his own.