boundary · noun C /ˈbɑʊn.dri/Full view
boundary (LINE)
C1 a line that divides two areas or forms an edge around an area
Dictionary example:

The mountains mark the boundary between the two countries.

Learner example:

This gives youngsters the opportunity to exchange opinions with people all over the world, and so the boundaries of the countries or the continents have less meaning. (Certificate in Advanced English; C1; Greek)

boundary (LIMIT)
C1 a limit
Dictionary example:

Your work is limited only by the boundaries of your imagination.

Learner example:

This is a movie that reminds us that a man's soul cannot be measured with a measuring tape, that passion knows no boundaries, and that love accepts no defeat. (Certificate in Advanced English; C1; Greek)

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