Definition of "Border" :

noun: a strip forming the outer edge of something

"The rug had a wide blue border."

noun: a decorative recessed or relieved surface on an edge

noun: a line that indicates a boundary

noun: the boundary of a surface

noun: the boundary line or the area immediately inside the boundary

verb: lie adjacent to another or share a boundary

verb: extend on all sides of simultaneously; encircle

verb: enclose in or as if in a frame

verb: provide with a border or edge

verb: form the boundary of; be contiguous to