Plural of estimation; multiple judgments or calculations about the value, size, or nature of something, often based on incomplete information.
From Latin 'aestimatio' (the act of valuing). The word entered English through Old French and came to mean both the process of estimating and the result of that process. The plural -s form is regular in English.
Economists and scientists live by estimations because they constantly need to work with incomplete data—estimations let us make decisions about the future even when we can't know everything.
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