Barrier

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Barrier

(n.) A carpentry obstruction, stockade, or other obstacle made in a passage in order to stop an enemy.
(n.) A fortress or fortified town, on the frontier of a country, commanding an avenue of approach.
(n.) A fence or railing to mark the limits of a place, or to keep back a crowd.
(n.) An any obstruction; anything which hinders approach or attack.
(n.) Any limit or boundary; a line of separation.