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say it: BAR-ee-ur
barrier is a noun meaning "a structure or object that impedes free movement". It carries 3 recorded senses.
a structure or object that impedes free movement
any condition that makes it difficult to make progress or to achieve an objective
“intolerance is a barrier to understanding”
anything serving to maintain separation by obstructing vision or access
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for barrier come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.