Accurate Definition & Meaning - Adjective

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maths

(to n significant digits) representing the first n digits of the given number starting with the first nonzero digit, but approximating to the nearest digit in the final position

since π = 3.14159…, the approximation 3.1416 is accurate to 5 significant digits.
(to n decimal places) giving the first n digits after the decimal point without further approximation

π = 3.1415 is in this sense accurate to 4 decimal places