History
History
History
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US
Meaning:
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an imaginary line between areas, countries, surfaces etc

outer limit

more synonyms
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Cases of word usage

1) a row of bushes, shrubs or tall plants etc forming a boundary for field, garden etc (hedge)

2) (the instrument of) the outer boundary of a closed figure or area (perimeter)

3) an external boundary or surface (periphery)

BOUNDARY as in Wiktionary
BOUNDARY as in Wikipedia