Noah Webster
Barrier
BAR'RIER. [See bar]
1. In fortification, a kind of fence made in a passage or retrenchment, composed of great stakes, with transums or overthwart rafters, to stop an enemy.
2. A wall for defense.
3. A fortress or fortified town on the frontier of a country.
4. Any obstruction; any thing which confines, or which hinders approach, or attack; as constitutional barriers.
5. A bar to mark the limits of a place; any limit, or boundary; a line of separation.