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Definition of barrier : 1. A carpentry obstruction, stockade, or other obstacle made in a passage in order to stop an enemy.
2. A fence or railing to mark the limits of a place, or to keep back a crowd.
3. A fortress or fortified town, on the frontier of a country, commanding an avenue of approach.
4. An any obstruction; anything which hinders approach or attack.
5. Any limit or boundary; a line of separation.

Synonyms:

embankment, outwork, limit, preventive, difficulty, rampart, palisade, barbed wire, bamboo curtain, partition, fortification, earthwork, parapet, sound or sonic or transonic barrier, thing, hamper, iron curtain, picket, bar, let, breastwork, stumbling block, stopper, trench, roadblock, limitation, include, boundary, open, help, prohibition, check, pale, traverse, bulwark

defense, armor, aversion, answer, backfire, moat, countermeasure, retort, counterattack, cover, response, guard, reply, protection, return, barricade, support, resistance, stronghold, safeguard, harbor, shield, rebuttal, shelter, buffer, security, fortress, argument, wall, screen

constraint, brake, encumbrance, jam, handicap, choke, stoppage, delay, bottleneck, bafflement, block, snag, deterrent, impasse, dam, congestion, disadvantage, drag, stop, blockage, catch, entanglement, inhibition, hurdle, clog, restriction, restraint, damper, snarl, obstacle, tangle, constipation, entrapment, mire, complication, hindrance, stay, bung, plug, impedance, frustration, drawback, blockade, impediment, opposition, crimp, obstruction, burden, interruption

blind, umbrella, lamp shade, veil, visor, awning, blinders, shadow, sunshade, Venetian blind, shade, panoply, shutter, canopy, curtain, parasol

enclosure, jail, cage, trap, fence, confinement, cell, prison, envelopment, pen

Usage examples:

• And against it something certainly must be reared as a barrier, if our race is to avoid ruin. - "Orthodoxy", G. K. Chesterton.
• It lies beyond the Great Sand Barrier, in a valley of the Inner Mountains; yea, at the very heart of Ruba el Khali. - "The Flying Legion", George Allan England.
• It was generally expected that the enemy would follow up the success by an immediate attack on Brentwood, the main barrier between Von Kronhelm and his objective- our great Metropolis. - "The Invasion", William Le Queux.