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I am trying to explain a mathematical point that is used for comparison such that all values are compared to it, like a "frame of reference". I've also thought of "pivot of comparison". Are any of these two correct or is there a better expression for this?

2 Answers 2

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Or how about a benchmark, defined as:

A standard by which something is evaluated or measured.

A reference point.

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How about reference point ...

noun
a basis or standard for evaluation, assessment, or comparison; a criterion.

[ODO]

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