free from error or defect; consistent with a standard, rule, or model; precise; exact.

careful or meticulous: an accurate typist.

adjective

faithfully representing or describing the truth

showing a negligible or permissible deviation from a standardan accurate ruler

without error; precise; meticulous

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 positionsince 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 approximationπ = 3.1415 is in this sense accurate to 4 decimal places

adj.

1610s, “done with care,” from Latin accuratus “prepared with care, exact, elaborate,” past participle of accurare “take care of,” from ad- “to” (see ad-) + curare “take care of” (see cure). The notion of doing something carefully led to that of being exact (1650s). Related: Accurately; accurateness.