Learn English – Boundary: single form or plural form

grammatical-number

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

?

Best Answer

"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?

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