The correct distinguishing feature from the provided choices is:
A postulate is assumed to be true, and it does not have to be proven.
Here’s a brief overview of the other terms for clarity:
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Theorem: A theorem is a statement that has been proven to be true based on previously established statements such as postulates and other theorems.
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Definition: A definition describes a term or concept and provides a precise meaning or understanding of what that term or concept entails. It does not need to be proven but is accepted as a basis for discussion.
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Conjecture: A conjecture is an unproven statement or hypothesis that is based on observations. It is a guess or proposition that may be true but requires evidence or a proof to be validated.
So, the rest of the options regarding theorems, definitions, and conjectures are inaccurate as described.