(mathematics) the number of significant figures given in a number
"the atomic clock enabled scientists to measure time with much greater accuracy"
The state of being accurate; being free from mistakes, this exemption arising from carefulness; exactness; correctness
"The surgeon praised the team's accuracy during the operation because no instruments were misplaced or damaged."
In plain English: Accuracy is how close something is to being correct or true.
"The accuracy of the weather forecast helped us decide whether to bring an umbrella."
Usage: Use accuracy to describe how close a measurement or statement is to the true value or correct fact. It applies when you need to emphasize that something was done without error due to precision or care.
The word accuracy first appeared in English in the 1660s as a noun formed by adding the suffix -cy to the adjective accurate. It entered the language to describe the quality of being correct or precise, reflecting the meaning of its root.