'Barrier' definitions:

Definition of 'barrier'

(from WordNet)
noun
A structure or object that impedes free movement
noun
Any condition that makes it difficult to make progress or to achieve an objective; "intolerance is a barrier to understanding" [syn: barrier, roadblock]
noun
Anything serving to maintain separation by obstructing vision or access

Definition of 'Barrier'

From: GCIDE
  • Barrier \Bar"ri*er\, n. [OE. barrere, barere, F. barri[`e]re, fr. barre bar. See Bar, n.]
  • 1. (Fort.) A carpentry obstruction, stockade, or other obstacle made in a passage in order to stop an enemy. [1913 Webster]
  • 2. A fortress or fortified town, on the frontier of a country, commanding an avenue of approach. [1913 Webster]
  • 3. pl. A fence or railing to mark the limits of a place, or to keep back a crowd. [1913 Webster]
  • No sooner were the barriers opened, than he paced into the lists. --Sir W. Scott. [1913 Webster]
  • 4. Any obstruction; anything which hinders approach or attack. "Constitutional barriers." --Hopkinson. [1913 Webster]
  • 5. Any limit or boundary; a line of separation. [1913 Webster]
  • 'Twixt that [instinct] and reason, what a nice barrier! --Pope. [1913 Webster]
  • Barrier gate, a heavy gate to close the opening through a barrier.
  • Barrier reef, a form of coral reef which runs in the general direction of the shore, and incloses a lagoon channel more or less extensive.
  • To fight at barriers, to fight with a barrier between, as a martial exercise. [Obs.] [1913 Webster]

Synonyms of 'barrier'

From: Moby Thesaurus