I. noun 1. a fence or other obstacle that prevents movement or access. • the mountain barrier between Norway and Sweden.
(Brit.) a gate at a car park or railway station that controls access by being raised or lowered.
3. a circumstance or obstacle that keeps people or things apart or prevents communication or progress • a language barrier
• the cultural barriers to economic growth.
– origin late Middle English (denoting a palisade or fortification defending an entrance): from Old French barriere, of unknown origin; related to barre.