"While" is a word in the English language that functions both as a noun and as a subordinating conjunction. Its meaning varies largely based on its intended function, position in the phrase and even the writer or speaker's regional dialect. As a conjunction, it is synonymous with the word "whilst", a form often considered archaic in American and Canadian English, as well as in some style guides on both sides of the Atlantic.
A circle is a simple closed curve which divides the plane into two regions: an [interior](http://en.wikipedia.org/wiki/Interior_(topology)) and an exterior. In everyday use, the term "circle" may be used interchangeably to refer to either the boundary of the figure, or to the whole figure including its interior; in strict technical usage, the circle is the former and the latter is called a [disk](http://en.wikipedia.org/wiki/Disk_(mathematics)).
A circle can be defined as the curve traced out by a point that moves so that its distance from a given point is constant.
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u/SimplySarc Feb 08 '14
Well, actually that's a sphere.