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boundary

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boundary/ˈbaʊndri/noun
pluralboundaries
boundary
/ˈbaʊndri/
noun
pluralboundaries
Learner's definition of BOUNDARY  
[count]  : something (such as a river, a fence, or an imaginary line) that shows where an area ends and another area begins
[count]  : a point or limit that indicates where two things become different
boundaries [plural]  : unofficial rules about what should not be done : limits that define acceptable behavior

know no boundaries

: to be capable of affecting people everywhere
: to have no limits
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