Relating to or used in the process of extending known patterns, data, or trends to estimate or predict unknown values.
From 'extrapolate' + suffix '-ory' (relating to or serving for). A formal adjective variant of 'extrapolative,' used in technical writing.
Scientists distinguish between 'interpolatory' methods (filling gaps between known points) and 'extrapolatory' ones (extending beyond known points)—extrapolatory methods are much riskier because you're guessing into unknown territory.
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