The boundary or perimeter of a circle is its circumference.
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It is an "open" circle. That is, a circle which is not filled in.
The circumference of an object - particularly a circle - is the distance around the outside of it.
Not sure about the circumfrince. The circumference of a circle is the boundary of the circle and its length is pi*d where d is the diameter if the circle, and pi is the irrational number that is approximately equal to 3.14159
A circle in which the distance from its centre to its boundary is 32 inches.
A diameter - provided it meets the boundary of the circle or sphere on opposite sides.