fenceline noun2 •The path a fence takes through a landscape; a long, usually straight, section of fence.The farmers up here will have a lot of cleaning to do along the fencelines before they bale hay next June or they will be baling kindling. — 2007 •(figurative) A narrow strip of territory that a municipality annexes to surround unincorporated territory that the municipality wants to reserve to itself for future growth. formsfencelines