Title: geometrical equivalence Long Title: IUPAC Gold Book - geometrical equivalence DOI: 10.1351/goldbook.G02618 Status: current Definition The symmetry correspondence among units belonging to the same chain. The symmetry elements always bear a special relationship to the chain axis. Related Term - line repetition groups: https://goldbook.iupac.org/terms/view/L03564 Source - Purple Book, 1st ed., p. 77 (http://old.iupac.org/publications/books/author/metanomski.html) Other Outputs - html: https://goldbook.iupac.org/terms/view/G02618/html - json: https://goldbook.iupac.org/terms/view/G02618/json - xml: https://goldbook.iupac.org/terms/view/G02618/xml Citation: Citation: 'geometrical equivalence' 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.G02618 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: 2026-08-10T11:04:18+00:00