en·croach·ment \-mənt\noun (-s) Etymology: Middle English encrochement, from Anglo-French, from Middle French encrochier + -ment 1.: the act or action of encroaching < the gradual encroachment of the white people upon the Indian territories > 2.: an instance of encroaching (as the building of a structure in a public park or a fence that projects over a neighbor's land)