What is the name for an object that cannot be added to?

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What is the name for an object that cannot be added to (for example, a circle can only have 360 degrees; any more degrees and it is no longer merely a circle)?
 
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Pjpic said:
What is the name for an object that cannot be added to (for example, a circle can only have 360 degrees; any more degrees and it is no longer merely a circle)?
I don't think there is a name for this concept.

In your example, a circle doesn't "have" 360 degrees. The measure of a central angle that encompasses the entire circle is 360 degrees, but we can talk about angles of more than 360 degrees.