The boundaries are not fixed; they expand as transport options improve and affordable housing moves further away from London.

When the new boundaries were fixed, the inhabitants living outside them were given notice to move inland.

The boundaries of his regno were only later fixed by a truce with the pope in October 1144.

Since these classifications are based on the characteristics of the individuals, their boundaries are not fixed.

Second, do not assume that such boundaries are fixed.

At this point, the boundary between England and Wales, which has existed ever since, was effectively fixed.

The boundaries between the continents were not fixed.

The left and right boundary are fixed at 1, while the upper and lower boundaries are set to 0.

In some cases, the boundary between Elfland and more ordinary lands is not fixed.

In other words, its boundaries were being fixed and called into question simultaneously.