demarcation

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Nay, farther; a legislature, instituted even by a written constitution, but without a special demarkation of powers, may, perhaps, be presumed to be left at large, as to all authority which is communicable by the people .
Performers and celebrities have sharp demarkation where the breast suddenly begins far from their midline and their breasts change shapes and even jump around during performances.
As one court observed, "the line of demarkation [sic] is not a line at all but a murky 'twilight zone.