boundary
US /ˈbaʊn.dər.i/
UK /ˈbaʊn.dər.i/
1.
a line that marks the limits of an area; a dividing line
:
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The river forms the natural boundary between the two countries.
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They set up a fence to mark the property boundary.
2.
a limit of what is acceptable or allowed
:
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It's important to set clear boundaries in any relationship.
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He pushed the boundaries of what was considered art.