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boundary (n.)

"that which indicates the limits of anything," 1620s, from bound (n.1) + -ary. Strictly, a visible mark indicating a dividing line, a bound being the limit or furthest point of extension of any one thing.

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Definitions of boundary from WordNet

boundary (n.)
the line or plane indicating the limit or extent of something;
Synonyms: bound / bounds
boundary (n.)
a line determining the limits of an area;
Synonyms: edge / bound
boundary (n.)
the greatest possible degree of something;
Synonyms: limit / bound
From wordnet.princeton.edu