Definition from macmillandictionary.com
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a proposal to redraw the city boundary
Akbar extended the boundaries of his empire in the north and to the south.
Estonians and Latvians began to query the status of their boundaries with Russia.
a boundary fence/wall
The lane once formed the boundary between the two villages.
a community in which class boundaries are very clearly drawn
new research that pushes back the boundaries of genetic science
The party’s support cuts across religious boundaries (=is not influenced by differences among religions).
The boundary between fact and fiction in her writing is often blurred.