I am not sure whether "boundary" should be used in single form or plural form. For example, should I say:

I developed this method to define A region's boundary OR I developed this method to define the boundaries of A region


  • Both are correct, with different implications. In the absence of constraints of context, you can use either.
    – Kris
    Dec 19, 2012 at 4:41

2 Answers 2


"Boundary" designates the entire curve which encloses A; "boundaries" designates the several portions of that curve which respectively constitute the boundary between A and B, between A and C, between A and D, and so forth. So it seems to me the question is Which is more appropriate to your method?


It depends on the nature of 'A region', but in some cases either boundary or boundaries can be used.

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