boundary

The definition of a boundary is a line or something else that marks a limit or border.

(noun)

An example of boundary is a barbed wire fence.

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See boundary in Webster's New World College Dictionary

noun pl. boundaries

any line or thing marking a limit; bound; border

Origin: bound + -ary

See boundary in American Heritage Dictionary 4

noun pl. bound·a·ries
  1. Something that indicates a border or limit.
  2. The border or limit so indicated.

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