Title: uncertainty of measurement Long Title: IUPAC Gold Book - uncertainty of measurement DOI: 10.1351/goldbook.U06553 Status: current Definition Parameter, associated with the result of a measurement, that characterizes the dispersion of the values that could reasonably be attributed to the measurand (the quantity being measured). Related Term - measurand: https://goldbook.iupac.org//terms/view/M03789 Source - VIM (https://www.iso.org/standard/45321.html) Other Outputs - html: https://goldbook.iupac.org/terms/view/U06553/html - json: https://goldbook.iupac.org/terms/view/U06553/json - xml: https://goldbook.iupac.org/terms/view/U06553/xml Citation: Citation: 'uncertainty of measurement' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.U06553 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Collection: If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. Accessed: 2026-07-02T19:59:12+00:00