noun, plural ac·cu·ra·cies.

  1. the condition or quality of being true, correct, or exact; freedom from error or defect; precision or exactness; correctness.
  2. Chemistry, Physics. the extent to which a given measurement agrees with the standard value for that measurement.Compare precision(def 6).
  3. Mathematics. the degree of correctness of a quantity, expression, etc.Compare precision(def 5).

noun plural -cies

  1. faithful measurement or representation of the truth; correctness; precision
  2. physics chem the degree of agreement between a measured or computed value of a physical quantity and the standard or accepted value for that quantity

1660s, from accurate + -cy.

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