Border (noun)

1. An edge or line that marks the outer limit of something.
2. A dividing line between two regions, countries, or areas.
3. A decorative strip around the edge of a piece of furniture, cloth, or paper.
4. The edge or surrounding area of a flat surface or object.
5. The edge or limit of a particular area of interest or concern.

Origin:

Middle english, from old french borde edge, from bord edge.

Examples:

1. The country's border with its neighbor was heavily guarded.
2. The tablecloth had a lace border.
3. The painting was set against a blue border.
4. The city was located near the border between two states.
5. The park was at the edge of the city and bordered a forest.