Precision is the quality of being exact and accurate, especially in measurements, actions, or details. It can also describe how closely repeated measurements or actions agree with each other.
“Precision” comes from Latin *praecisio*, “a cutting off,” from *praecidere*, “to cut off.” It suggests trimming away inaccuracy and vagueness to reach exactness.
In science, precision isn’t just about being right once; it’s about getting nearly the same result every time. You can be precisely wrong if you’re consistently off in the same way, which is why accuracy and precision are cousins, not twins.
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