Pronunciation: (pri-sizh'un),[key] —n. 1. the state or quality of being precise.
2. accuracy; exactness: to arrive at an estimate with precision. 3. mechanical or scientific exactness: a lens ground with precision. 4. punctiliousness; strictness: precision in one's business dealings. 5. Math.the degree to which the correctness of a quantity is expressed. Cf. accuracy (def. 3).
6. Chem.,Physics.the extent to which a given set of measurements of the same sample agree with their mean. Cf. accuracy (def. 2).
—adj. of, pertaining to, or characterized by precision: precision swimming; precision instruments for aircraft.