|1.||anything serving to obstruct passage or to maintain separation, such as a fence or gate|
|2.||anything that prevents or obstructs passage, access, or progress: a barrier of distrust|
|3.||anything that separates or hinders union: a language barrier|
|4.||a. an exposed offshore sand bar separated from the shore by a lagoon|
|b. (as modifier): a barrier beach|
|5.||(sometimes capital) that part of the Antarctic icecap extending over the sea|
|[C14: from Old French barriere, from barre|
barrier bar·ri·er (bār'ē-ər)
A structure, such as a fence, built to bar passage.
A boundary or limit.
An obstacle or impediment.
Something that separates or holds apart.
Something immaterial that obstructs or impedes behavior.
A physical or biological factor that limits the migration, interbreeding, or free movement of individuals or populations.